ID: 56947
Title: Comparative studies of concentrations of Cu and Zn in the surface intertidal sediments collected from east, south and west coasts of Peninsular Malaysia
Author: C K Yap, W H Cheng and S G Tan
Editor: Prof V Subramanian
Year: 2008
Publisher: Capital Publishing Company, Vol 5, No 2, April 2008
Source: Centre for Ecological Sciences
Reference: None
Subject: Asian Journal of Water, Environment and Pollution
Keywords: West and east coasts of Peninsular Malaysia, Cu and Zn concentrations, surface sediments
Abstract: Malaysia is one of the fast economic developing nations in the region. From the ecotoxicological points of view, many environmental concerns are expected to continually rise up due to the potential anthropogenic inputs such as industries and urbanization. Although the heavy metal concentrations had been reported in the sediments from the west coast of Peninsular Malaysia, the east coast receives lesser attention since it is not as populous and industrialized as in the west coast. In this study, concentration of Cu and Zn for surface sediments were determined and the samples were collected between 2002 and 2004, from west (five sites), south (five sites) and east (10 sites) intertidal area of Peninsular Malaysia. Total Cu concentrations ranged from 3.80 to 117 ?g/g dry weight with south coast recording the highest mean concentration (38.8 ?g/g dry weight), followed by west (31.13 ?g/g dry weight) and east coasts (12.96 ?g/g dry weight). Total Zn concentrations ranged from 36.6 to 395 ?g/g dry weight with west coast recording the highest mean concentration (137 ? g/g dry weight), followed by south (111 ?g/g dry weight) and east coasts (73.8 ?g/g dry weight). Apart from the comparison based on the conventional total concentrations of metals, three geochemical fractions (EFLE, acid-reducible and oxidisable-organic) were also useful in identifying the polluted sites in which the three geochemical fractions in the sediments of the west and south coasts of Peninsular Malaysia had significantly (P<0.05) higher concentrations of Cu and Zn when compared to those in the east coastal sediments. This had strengthened our previous assumption that the east coast is less polluted by anthropogenic Cu and Zn when compared to the west and south coasts of Peninsular Malaysia.
Location: TE 15, New Biology Building
Literature cited 1: None
Literature cited 2: None
ID: 56946
Title: Landfill impact on Ground water
Author: Syeda Azeem Unnisa and B Srivani
Editor: Prof V Subramanian
Year: 2008
Publisher: Capital Publishing Company, Vol 5, No 2, April 2008
Source: Centre for Ecological Sciences
Reference: None
Subject: Asian Journal of Water, Environment and Pollution
Keywords: Domestic solid waste, landfill, leachate, groundwater pollution
Abstract: Hyderabad is a major Indian city with a population of more than six million and the extent of solid waste generated from the city is estimated to be 2000 to 2500 tonnes per day. The solid wastes generated in Hyderabad metropolitan areas are majorly disposed off as landfill in low-lying areas. There has been a serious concern about the contamination of ground water when the wastes are, thus, disposed. For the present study two landfill sites- Autonagar and Golkonda- were selected. The impact of municipal solid waste disposal on groundwater characteristics was investigated by obtaining groundwater samples from both sites. The groundwater samples at both the landfill sites were polluted and are unfit for human consumption and domestic use but could be used for irrigation purpose. Overall analyses indicate increasing risk for sustainability of groundwater resources.
Location: TE 15, New Biology Building
Literature cited 1: None
Literature cited 2: None
ID: 56945
Title: A case study on bulking problems in paper recycling Effluent Treatment Plant in Malaysia
Author: Ghufran Redzwan, Lisa Lee Siew Ying, Shaliza Ibrahim and Suffian Annuar
Editor: Prof V Subramanian
Year: 2008
Publisher: Capital Publishing Company, Vol 5, No 2, April 2008
Source: Centre for Ecological Sciences
Reference: None
Subject: Asian Journal of Water, Environment and Pollution
Keywords: Recycled paper mill effluent, activated sludge process, bulking, filmentuous bacteria, nutrients supplement
Abstract: This study was conducted to investigate the cause of bulking problem at the effluent treatment plant (ETP) of a paper recycling plant in Malaysia. Hypothetically, the effluent is lacking nutrients and could induce the overpopulation of filamentous bacteria, and further cause the bulking problem during the effluent treatment using activated sludge process. Experiment to simulate treatment operations had been set up at laboratory. The simulation showed that the bulking started to occur after the first cycle of the fed-batch operation with the typical effluent. To make up the lacking of nutrients in the effluent, urea (N) and phosphate (P) were added as supplements with the ratio of BOD: N:P equal to 100: 1.0:0.7. The supplemented effluent was again tested by a simulation study and showed that the bulking problem started to take place after the third cycle of feeding regime. Bulking problem also periodically took place in the actual operation when the same supplemented formula was applied; however the frequency of occurrence was lesser. Therefore, this study has shown that other than the lack of nutrients, there are other factors that could cause bulking problem.
Location: TE 15, New Biology Building
Literature cited 1: None
Literature cited 2: None
ID: 56944
Title: Sustainable agricultural intensification for livelihood and food security in Nepal
Author: Bed Mani Dahal, Bishal Kumar Sitaula and Roshan Man Bajracharya
Editor: Prof V Subramanian
Year: 2008
Publisher: Capital Publishing Company, Vol 5, No 2, April 2008
Source: Centre for Ecological Sciences
Reference: None
Subject: Asian Journal of Water, Environment and Pollution
Keywords: Cropping intensification, food deficit, Nepal, peri-urban, semi-urban, sustainable development
Abstract: With increased market access and road links to urban centres, settled agriculture in Nepal is becoming transformed into intensified cropping, especially in peri- and semi-urban areas. On a global scale, major driving factors for intensification are: population growth, lack of alternate employment, profit motive, market access, road links, availability of agricultural inputs and organizational cooperation. However, in Nepal the main driving factor is necessity due to lack of other income opportunities. The outcomes of agricultural intensification, namely, improved economic condition of farmers with higher production and good market price are intended to address the developmental challenges of high population growth, food deficit, agricultural trade modalities, fragile ecology, and national policies. In spite of soil fertility loss, erosion, workload and pollution, agricultural intensification is found to be a viable option for better livelihood in developing countries. This review paper discusses the global driving factors of intensification in the local context highlighting their positive and negative impacts.
Location: TE 15, New Biology Building
Literature cited 1: None
Literature cited 2: None
ID: 56943
Title: Performance evaluation of investment companies: a free disposal hull approach
Author: Sahar Alimardani, Masoud Ghafari and Maryam Farmani
Editor: Prof Natarajan Gajendran
Year: 2012
Publisher: Indian Society for Education and Environment (iSee), Vol 5, Issue 7, July 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: Indian Journal of Science and Technology
Keywords: Perfornance Evaluation, Investment company, Free disposal hull
Abstract: The aim of this study is to assess the financial performance of Iranian mutual fund companies. For this , ten financial indices are extracted from the existing data and the input oriented structure of the free disposal hull (FDH) model is applied to identify their performance. We report that the basic FDH does not distinguish between efficient and inefficient units. Hence, a super efficiency analysis model AP-FDH is applied to gain the complete ranking. Accordingly, teh Booali Ivestment Corporation, the second best investment company inthe Tehran Stock Exchange (TSE) ranking, is identified as the superior investment company in the proposed ranking.
Location: TE 15, New Biology Building
Literature cited 1: None
Literature cited 2: None
ID: 56942
Title: Vermicomposting of animal dung and its laboratory evaluation
Author: Hargopal Singh, Pritpal Singh and S S Hundal
Editor: Prof Natarajan Gajendran
Year: 2012
Publisher: Indian Society for Education and Environment (iSee), Vol 5, Issue 7, July 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: Indian Journal of Science and Technology
Keywords: Animal dung, Earthworms, technique, vermicomposting
Abstract: A laboratory studies were conducted on the evaluation of vermicompost obtained from Farm Yard Manure and farm yard manure (FYM) prepared from the same feedstock by only thermophilic processing. Processing of animal dung at a moisture content of around 60% consisted of 6 treatments (T1) no earthworms, no moisture, no turning, no microbial culture (E0M0T0C0), T2) no earthworms, moisture, weekly turining, no microbial culture (E0M1T1C0) , (T3) Eisenia fetida earthworms, moisture, weekly turning, no microbial culture (E1M1 T1C0), (T4)Eisenia fetida earthworms, moisture, weekly turning, no microbial culture (E1M1T1C0), (T4) Eisenia fetida earthworms, moisture, no turning, no microbial culture (E1M1T0C0), (T5) no earthworms, moisture, weekly turning, microbial culture added (E0M1T1C1), (T6) Eisenia fetida earthworms, moisture, weekly turning, microbial culture added (E1M1T1C1). Laboratory analysis for nutrient composition revealed that there was no appreciable change in nutrient composition in the vermicompost over FYM. Therefore, composting the animal dung by scientific means is an efficient as vermicomposting the animal dung.
Location: TE 15, New Biology Building
Literature cited 1: None
Literature cited 2: None
ID: 56941
Title: Aspergillus niger biosensor based on the oxide (SnO2) nanostructures: Nanopowder and thin film
Author: E Azgurm R Etefagh, N Shahtahmasebi, M Mohammadi, D Amiri and R Sarhaddi
Editor: Prof Natarajan Gajendran
Year: 2012
Publisher: Indian Society for Education and Environment (iSee), Vol 5, Issue 7, July 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: Indian Journal of Science and Technology
Keywords: Nanobiosensor, Aspergillus niger fungi, Spray pyrolyis technique, Sol gel method
Abstract: In this paper, SnO2 thin film and nanopowder were prepared by spray pyrolysis and sol-gel methods, respectively. The SnO2 nanostructures were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Then Aspergillus niger fungus were cultured in an appropriate medium and were exposed to SnO2 nanofilm and nanopowder. The non-system electric resistance was measured in the produced gases and the effect of time and temperature on nanobiosensors was studied. Then, SnO2 nanobiosensors was characterized in the presence of silicagel and calcium carbonate.
Location: TE 15, New Biology Building
Literature cited 1: None
Literature cited 2: None
ID: 56940
Title: Satellite images edge detection based on morphology models fusion
Author: Mahdi Ghasemi Naraghi and Mahdi Koohi
Editor: Prof Natarajan Gajendran
Year: 2012
Publisher: Indian Society for Education and Environment (iSee), Vol 5, Issue 7, July 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: Indian Journal of Science and Technology
Keywords: Satellite, image processing, edge detection, multi spectral images
Abstract: One of the first steps of feature extraction is edge detection. There are various methods for edge detection such as sobel operator, log method and canny operator but with disadvantages (create noise, image smoothing and discontinuous edge detected). We present an improved method for edge detection. In this method, edge detected by morphology ' s operator and their combination and with the use of various structure elements of images in satellite and remote sensing.
Location: TE 15, New Biology Building
Literature cited 1: None
Literature cited 2: None
ID: 56939
Title: Generation expansion planning for Iranian power grid aiming at providing reliability by comparing WASP-IV program and proposed algorithm by dynamic programming
Author: Bahram Noshad, Mina Goodarzi and Shahla Kivan
Editor: Prof Natarajan Gajendran
Year: 2012
Publisher: Indian Society for Education and Environment (iSee), Vol 5, Issue 7, July 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: Indian Journal of Science and Technology
Keywords: Generating expansion planning, reliability, loss of load probability, WASP-IV program, Matlab program
Abstract: Generating expansion planning is one of the most significant parts in grid expansion planning. The generating expansion planning extends from 10 to 30 years; reliability is one of the most vigorous indices for reliability generating expansion planning, the loss of load Probability index is one of the most vigorous indices for reliability system. This paper tends to represent primarily generating expansion evaluation with the help of WASP-IV program and proposed algorithm using MATLAB program for Iranian power grid with and without pumped storage power plants within a time period of 10 years (2020-2020) , then tne results ahve been compared.
Location: TE 15, New Biology Building
Literature cited 1: None
Literature cited 2: None
ID: 56938
Title: Assessment of Cover Change in the Harenna Habitats in Bale Mountains, Ethiopia, using GIS and Remote Sensing
Author: Misrak Alemu, K V Suryabhagavan and M Balakrishinan
Editor: B Gopal, P S Pathak, A Raman, S Y Lee
Year: 2012
Publisher: National Institute of Ecology, Vol 38, No 1, March 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: International Journal of Ecology and Environmental Sciences
Keywords: Afro-alpine vegetation, Ericaceous forest, Forest cover change, Harenna forest
Abstract: An assessment was made on the extent and rate of forest cover change in Harenna forest, Ethiopia during 1986 to 2006 using remote sensing and GIS techniques. Landsat images ETM+ of the year 1986, and SPOT 2006 were used to identify forest cover changes, rate of deforestatin and the type of land-cover to which the forest was converted. The major land-use/land-cover types in the study area were rain forest, ericaceous forest, afro-alpine vegetation, shrub land, grass land, bare land, and agriculture and settlement areas. The total area of agriculture and settlements increased from 63,950 ha (9.4%) to 1,00,080 ha (12.3%), grass land increased from 33, 185 ha (4.8%) to 48,603 ha. (7.1%) and afro-alpine vegetation increased from 14, 294 ha (2.1%) to 22, 827 ha (3.4%) during the period 1986 - 2006. During the same period, the forest cover has declined from 3, 13, 472 ha to 2, 92, 274 ha. This implies tha the forest coverage had decreased by 21, 198 ha. at an average rate of 1, 059.9 ha. per year.
Location: TE 15, New Biology Building
Literature cited 1: None
Literature cited 2: None
ID: 56937
Title: Soil quality and soil health: A review
Author: Joylata Laishram, K G Saxena, R K Maikhuri and K S Rao
Editor: B Gopal, P S Pathak, A Raman, S Y Lee
Year: 2012
Publisher: National Institute of Ecology, Vol 38, No 1, March 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: International Journal of Ecology and Environmental Sciences
Keywords: Soil functions, soil indicators, soil quality indices, soil organic carbon, carbon management index
Abstract: Soil health and soil quality are defiend as the capacity of soil to function as a vital living system within land use boundaries. This function which sustains biological productivity of soil also maintains the quality of surrounding environment and human health. Thus the two terms are used interchangeably although it is important to distinguish that, soil quality is related to soil function, whereas soil health presents the soil as a finite non-renewable and dynamics living resource. In this review, we deal with soil health concept which include interactions between plant inputs and soil in creating a healthy environment. Adverse effects on soil health and soil quality arise from nutrient imbalance in soil, excessive fertilization, soil pollution and soil loss processes that are increasingly becoming common in developing countries. This review will examine the development of soil health approaches as well as the content of soil health and soil quality information and its application to reduce negative impacts on agricutural productivity and long term sustainability.
Location: TE 15, New Biology Building
Literature cited 1: None
Literature cited 2: None
ID: 56936
Title: Mappign Prosopis juliflora using satellite data in a part of Indian Thar desert
Author: R Vijayarahavan and S Sundaramoorthy
Editor: B Gopal, P S Pathak, A Raman, S Y Lee
Year: 2012
Publisher: National Institute of Ecology, Vol 38, No 1, March 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: International Journal of Ecology and Environmental Sciences
Keywords: Prosopis juliflora, spectral separability, texture features, vegetation indices
Abstract: Prosopis juliflora, an invasive species, is capable of growing in a wide variety of soils and climatic conditions. By aggressive encroachment, it degrades ecosystem by reducing species diversity. An attempt has been made to map the invasive plant in Indian desert district-Jodhpur using satellite data. Hyperspectral, high spatial resolution data were used to study the spectral separability of P. juliflora with other five prominent native species viz., Acacia senegal, Calotropis procera, Euphorbia cauducifolia, Ziziphus mauritiana and Capparis decidua. Multispectral satellite data corresponding to SPOT-Multispectral (SPOT-XS) and IRS-Linear Imaging Self-scanning Sensor-3 (IRS-LISS3) were synthesized from hyperspectral data of the species obtained in natural conditions. Vegetation indices (VIs) and texture mesures were derived from these data. Based on overall accuracy of classification, the best combination of spectral and feature bands were chosen. The best data combination and the methodology were employed over XS bands of SPOT (1987-89) data and LISS3 bands of IRS (2003) data. The overall accuracy of 86.98% and 89.86% were obtained from SPOT-XS and IRS-LISS3, respectively. User ' s accuracy (UA) of 62.24% and 70.15% for P. juliflora class were obtained from the SPOT and IRS datasets, respectively. P. juliflora has shown aggressive encroachment and increased 61.68 sq. km area during the last fifteen years.
Location: TE 15, New Biology Building
Literature cited 1: None
Literature cited 2: None
ID: 56935
Title: Litterfall dynamics in village bamboo grove of Barak valley, Assam
Author: Arun Jyoti Nath and Ashesh Kumar Das
Editor: B Gopal, P S Pathak, A Raman, S Y Lee
Year: 2012
Publisher: National Institute of Ecology, Vol 38, No 1, March 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: International Journal of Ecology and Environmental Sciences
Keywords: Bamboo grove, nutrient use efficiency, turnover rate, trurn over time
Abstract: Leaf litters of bamboos are the potential source of nutrient input in the village land use systems. Bamboo grove is one such land use where bamboos are managed either in pure or in mixed patches with other plant species. Present study was carried out in a bamboo grove of Cachar district of Barak Valley. Assam to understand the flux of different fractions of litter fall, litter standing crop, turnover rate, turnover time for different litter components and nutrient use efficiency of the bamboo species. Litter fall was studied by laying permanent litter traps followed by collection of litter fractions at monthly interval over a period of three year. Mean litterfall of the stand was 7.51 Mg ha-1yr-1. The contribution of leaf, sheath and branch litter in total litter fall was in order of 55-65%, 29-38% and 5-7% respectively. Linear relationship between Aridity Index and litter fall data exhibited the existence of negative relationship between leaf fall, sheath fall and total litter fall. Leaf litters had the higher turnover rate (0.56-0.58) and lower turnover time (1.72-1.75) than sheath and branch litter. In leaf litter turnover rate for K was higher (0.61-0.67) than P (0.53-0.56) and N (0.54-0.55). P exhibits higher nutrient use efficiency than N and K. Role of bamboo litter as potential nutrient source in the village landscape is discussed.
Location: TE 15, New Biology Building
Literature cited 1: None
Literature cited 2: None
ID: 56934
Title: Stratigies for sustainable fisheries in the Indian Part of the Ganga-Brahmaputra River basins
Author: K K Vass, Manas K Das, R K Tyagi, Pradeep K Katiha, S Samanta, N P Shrivastava, B K Bhattacharjya, V R Suresh, V Pathak, Ganesh Chandra, D Debnath and Brij Gopal
Editor: B Gopal, P S Pathak, A Raman, S Y Lee
Year: 2011
Publisher: National Institute of Ecology, Vol 37, No 4, Dec 2011
Source: Centre for Ecological Sciences
Reference: None
Subject: International Journal of Ecology and Environmental Sciences
Keywords: Beels, Climate change, Coldwater fishery, Dams and barrages, Embankments, Environmental flows, fisheries decline, floodplain, Hilsa, Livelihoods, pollution, sediments, socio-economics of fishers
Abstract: Riverine fisheries are of particular importance in the tropical regions as they provide food and nutrition to millions of people and support their livelihood. However, ever-increasing, multiple demands on water for irrigated agriculture, domestic and industrial supplies and hydropower generation have greatly impacted upon the river flows and riverine habitats and consequently the fisheries and riverine -fish-dependent communities. Other anthropogenic activities such as deforestation, mining, urbanisation and various flood control measures have further degraded the river ecosystems. Yet, little attention is paid to the fisheries and issues of conservation and sustainability of riverine ecosystems which contribute significantly to the food security and economy of the people.
Three major Himalayan rivers - Indus, Ganga and Brahmaputra - are of greatest importance the Indian subcontinent as their drainage basins lie in China, India, Pakistan, Nepal, Bhutan and Bangladesh, cover nealry two-thirds of the subcontinent and are among the most densely populated regions of the world. Of these, Ganga and Brahmaputra, drain 26.2% and 5.9% respectively, of the total Indian territory, and join (together with another river, Meghna) in their lower reaches within Bangladesh before forming the world ' s largest delta and supporting the single largest patch of mangroves, the Sundarbans. The Ganga and Brahmaputra basins are sometimes treated as sub-basins of the combined Ganga-Brahmaputra-Meghna (GBM) basin. We review here the state of two major Himalayan rivers of India, Rivers Ganga and Brahmaputra, with reference to their fisheries, summarise various threats to them and discuss strategies for their sustainable management in the context of current policies, laws and institutional arrangements.
Physiographically, the Ganga river is divisible into Upland reaches (from sources at 4100 m altitude to Rishikesh at 360m; gradient 1:67; and equivalent range of its northern tributaries), Upper plains (from Rishikesh to Allahabad (58 m altitude; gradient 1: 4100), Middle plains (from Allahabad to Farakka (19 m altitude; gradient 1:13000) and Lower plains (the delta in India and Bangladesh, which includes the Sundarbans and an extensive floodplain). River Ganga in the upper stretch has a vast catchment formed by River Yamuna and its tribuataries joining it from the south, and the many tributaries originating in the Central Himalaya. River Brahmaputra has more than one-third of its catchment within India where it receives a large number of tributaries on its both banks. The upper reaches flow through mountain ranges and narrow valleys but later the river forms extensive floodplains.
The Ganga and Brahmaputra basins experience a mosoonal climate that exhibits extremes of spatial and temporal variability in temperature (sub-freezing to nearly 500C) and precipitation (10 cm in westernmost parts to >500 cm in the east). About 80% of rainfall occurs during the monsoon months (June to September ) and this is reflected in the discharge of the two rivers and their tributaries that increases up to 100 times its dry season values. The two rivers are also unique in carrying huge sediment loads that are among the highest in the world.
Both Ganga and Brahmaputra are rich in their fisheries (265 species in Ganga and 167 species in Brahmaputra that include both freshwater adn estuarine species). River reaches vary greatly in the proportion of species they contain; the Alaknanda has the lowest number of species (41). The upper stretches of the two rivers (up to Haridwar in river Ganga and Pasighat in river Brahmaputra) support Mahseers, carps, snow trouts and catfishes. Commercial fisheries in both the rivers assume importance in the middle and lower stretches. Over the years, drastic decline in fish catch from the rivers have adversely impacted the livelihoods of landless fishers; they simply fish poverty every time they go to river to catch fish. This situation has been caused also by factors other than the fishery in these river systems.
Although the flows of River Ganga and its tributary Yamuna had been diverted soon after their decent on to the plains more than a century ago, intensive river regulation has occurred in the post-Independent India. Numerous dams and barrages have been constructed over all tributaries, and thier large stretches have been channelised by embankments. Numerous hydel projects have come up throughout the mountain stretches and many more are in different stages of development. Thus, both longitudinal and lateral connectivity of the rivers has been greatly lost and the migration of the fishes to thier breeding and feeding sites has been obstructed. These changes have resulted in significant decline of fisheries, particularly the cold water fishes (snow trout and mahseers) in the upper stretches and Indian major carps (IMC) in the plains. Among the more prominent and well known effects has been that of the Farakka barrage on river Ganga shortly before it enters Bangladesh. While the Indian shad, Tenualosa ilisha has declined almost completely upstream of the Farakka barrage, the fisheries downstream have increased several fold.
Increased deforestation in the upper catchment basins of rivers is also having an adverse effect on water quality through increased siltation and alteration of river regimes with the increased runoff during the rains and reduced flow during dryer periods. Besides extensive alteration of flow regimes and the loss of floodplain habitats, the rivers have been severely impacted by excessive discharge of untreated or only partly treated domestic sewater and industrial effluents all along their course. Climate change is projected to stress the fisheries furhter with teh melting of glaciers, rise in water temperature, alteration of flow regimes, extreme events like flood and drought, and change in awter demands for other uses.
Conservation and sustainable management of fisheries must be based on natural recruitment by protecting the micro- and macro- habitats of different fishes for their breeding, spawning, feeding and refuge. Maintenance of environment flows is urgently required in the affected reaches. Further, management for sustainable fishery in the Ganga-Brahmaputra river system requires effective networking of the multiple stakeholders through appropriate institutional arrangements for development, implementation, policy and planning of management of fish stock, production, marketing and distribution. There is a strong need to involve all basin states of India to evolve policies on water and biological resources of the rivers. Cooperation between India and Nepal in the management of the migratory stock of Mahseer and between India and Bangladesh in the management of Hilsa is also needed. It is hoped that the recently constituted Ganga River Basin Authority in India will address some of these issues to achieve the objective of sustainable fisheries in future.
Location: TE 15, New Biology Building
Literature cited 1: None
Literature cited 2: None
ID: 56933
Title: A deterministic method to integrate triangular meshes of different resolution
Author: Giorgio Agugiaro, Thomas H Kolbe
Editor: George Vosselman
Year: 2012
Publisher: Elsevier, Vol 71, July 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: ISPRS Journal of Photogrammetry and Remote Sensing
Keywords: DSM, DTM, Multi-resolution data integration, Surface generation, Laser scanning
Abstract: As a result of new sensors and methodologies that allow for faster and more accurate data acquisition, the production of highly detailed 3D models is becoming part of the standard workflow in many disciplines- architecture, cultural heritage, urban planning, and others. At the same time, new related problems have emerged concerning the management of the resulting large datasets and the integration of data coming from different sources. Data integration among heterogeneous datasets can lead to a variety of errors, and the reasons for htese errors are multiple including geometric, topological or semantic incompatibilities, different resolutions and accuracies, and data acquired at different times. To overcome such errors, the integration of heterogeneous datasets requires apporpriate homogenisation techniques.
This article presents a new deterministic approach for the integration of a high resolution surface model and a lower resolution surface model, both given as triangular meshes embedded in 3D space, by means of a transition surface. The method can be applied after both datasets have been aligned. The derivation of the transition surface exploits extra data that are typically available in the high resolution model. These extra data (e.g. quite common when using a laser scanner) must be 2.5 D and located around the high resolution model, they represent a sort of planimetric buffer around the high resolution object that can be thought as a "collar". The proposed method generates a geometrically and topologically sound and continuous 2.5 D surface that integrates the two models using the data contained in the collar. It takes into account the different quality aspects of the low and high resolution models such as point height, point density, and height gradient, and then creates a transition surface that interpolates these aspects between the embedded high resolution model and the surrounding low resolution model. The article also presents some experimental results, obtained from real datasets, and concludes with some remaining issues and possible improvements to the method.
Location: TE 12, New Biology Building
Literature cited 1: None
Literature cited 2: None