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University of Twente (2006)

Analysis of hydrogeological system and land cover for assessment of risks to irrigated agriculture in Thar desert : Charanwala system of the Indira Gandhi canal

Bhakar R

Titre : Analysis of hydrogeological system and land cover for assessment of risks to irrigated agriculture in Thar desert : Charanwala system of the Indira Gandhi canal

Auteur : Bhakar Rajesh

Université de soutenance : University of Twente International Institute for Geo-Information Science and Earth Observation (ITC)

Grade : Master of Science in Geo-Information Science and Earth Observation 2006

Résumé
IGNP-Indira Gandhi Nahar (Canal) Project, situated in the Thar Desert of North-Western India is one of largest irrigation projects in the world. Sustainability of irrigated agriculture is threatened due to hazard of ‘Land Degradation’- manifest ed in the form of Waterlogging and Sand Dune Reactivation. The project command area lacks surface drainage and the sub-surface drainage is impeded by presence of a hydrogeological barrier composed of sticky and gypseous clays beneath the sandy surface soils. Simultaneously, inadequate and erratic irrigation supplies make irrigated agriculture unreliable for the farmers. Understanding the surface-water (irrigation) and groundwater interaction in the command area of IGNP Stage-I I is essential for assessment of risks to sustainability of irrigated agriculture in the Thar Desert. This study aims at quantification of the interaction of surface-water and groundwater in upper reaches of the Charanwala System of Indira Gandhi Canal Project, through a distributed physically based model to understand the effect of irrigated agriculture system on groundwater regime. For carrying out this investigation, the interaction between surface- water and groundwater in the Upper Charanwala System was conceptualized. Such an investigation involves a large data base creation about information on the groundwater recharge zone, frequency and quantity of irrigation application, depth to the hydrogeological barrier barrier from the ground, suitable digital elevation model, soil-hydrogeological parameters, and meteorological parameters, and g round coverage by the crops The parameterisation of the model domain was carried out by ground surveys and existing scientific/ ancillary datasets. The land cover, seasonal area under crops, groundwater recharge zone and irrigation network were extracted using multi-temporal satellite imagery. The groundwater table was created by using the DGPS derived elevation data for piezometers in study area and the depth to groundwater data records. The soil-hydrologic parameters generated from ground investigation compaign and lab work were upscale d by linking them to l and cover units. The AST ER DEM and SRTM D EM were compared. The SRTM D EM was found relatively more accurate and was chosen as the DEM for generating the hydrogeological barrier’ s DEM and the initial groundwater thickness above it for inputing in to the model. The model could be only partially calibrated. However, this initial attempt at modeling the complex irrigation input and groundwater table changes allowed some preliminary idea about groundwater movement.

Version intégrale (ITC)

Page publiée le 11 janvier 2012, mise à jour le 26 janvier 2018