Faculty Publications

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    Automated extraction of drainage network and watershed boundary from ASTER DEM and SRTM DEM and comparison with Topomap - A case study
    (2013) Megha, V.; Manju, P.; Ashitha, M.K.; Gopinath, G.
    For proper planning and management of water resources the adequate delimitation of watershed and its drainage is highly essential. This work deals with the evaluation of drainage network extracted automatically from Digital Elevation Models (DEM) obtained from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Shuttle Radar Topography Mission (SRTM) and watershed delineation. The comparison of drainage characteristics derived from satellite data with the topomap were analyzed. Bharathapuzha River basin is spreading its drainage network in Kerala and Tamilnadu. Arc Hydro tools (version 2.0) an application extension for Arc GIS 10 recently released by ESRI was used to extract drainage network. The threshold value for deciding on the required drainage density is arrived at by trial and error method where the watershed boundary derived from digital network matches the digitized boundary most accurately. The comparison of drainage network derived from ASTER and SRTM with the drainage from topomap is based on the stream length aspect. The length of the drainage network derived from the DEMs has a better resemblance with the topomap. © 2013 CAFET-INNOVA TECHNICAL SOCIETY.
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    INFLUENCE OF LAND USE LAND COVER CHANGE ON RUNOFF CHARACTERISTICS OF NETRAVATHI RIVER CATCHMENT, KARNATAKA, INDIA
    (Zibeline International Publishing Sdn. Bhd., 2024) Dwarakish, G.S.; Pai, J.B.; Jubina, C.K.
    The effect of LU/LC on the streamflow characteristics of the Netravathi river basin, Karnataka, India, is studied using Soil and Water Assessment Tool (SWAT) model. Landsat images, soil map from FAO, ASTER DEM (30m grid) and streamflow data, forms the database for the present work. The most significant changes from 1981 to 2015, in the LU/LC includes agricultural land (31.86%), built-up area (67.9%), forest cover (-20.01%), coconut plantation (55.12%), other vegetation (-18.55%) and others (-11.82%). The verification of performance of model was carried out by the coefficient of determination values (R2 > 0.8) and N S E (NSE > 0.78) were obtained and hence proved that SWAT model performance in estimating streamflow.. The average streamflow is increased by 13.74% from 1981 to 2015, which is mainly due to dynamic changes in LU/LC. Hence, it can be concluded that changes in LU/LC have a direct impact on streamflow in the study area. © 2024, Zibeline International Publishing Sdn. Bhd.. All rights reserved.