PRIORITIZATION OF SUB WATERSHEDS AND GROUNDWATER POTENTIAL ZONES MAPPING OF CHANDRABHAGA RIVER CATCHMENT USING MCDM APPROACH AND GEOINFORMATICS
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Date
2023-02-01
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G. B. Pant University of Agriculture & Technology, Pantnagar-263145
Abstract
The conservation of natural resources is essential to the growth of any region. For a developing
nation like India, judicial use of available resources is the utmost necessity and targeting locations of such
life sustaining resources will help in saving ti me and provide security. Management of land against erosion
and providing water security is the objective of every researcher involved in the field of resources
management. With this goal in mind, the present study on Chandrabhaga River catchment of Rajsam and
district in Rajasthan, was undertaken with the objectives to study morphometric parameters of the catchment
with the use of PCA (Principal Component Analysis), prioritization of sub watersheds using MCDM method
(AHP) and identification of groundwater p otential zones.
ArcGIS software was used for preparation of various data relating to the study area by using
toposheets, DEM data and satellite images. The Chandrabhaga River catchment was sub divided into 9 sub
watersheds, SW1 SW9 and 13 morphometric par ameters under three (linear, areal and relief) aspects were
computed. PCA was performed and 4 morphometric parameters were extracted and the other parameters
correlated with them were considered for performing prioritization using AHP for erosion susceptib ility
assessment. For AHP method, criteria were ranked using significant positive correlation values. Out of 9 sub
watersheds, SW1, SW2, SW3 and SW4 with total area of 321.90 km 2 , were identified as most vulnerable to
erosion due to steep physiography, hig h drainage densities and stream frequencies. So, the soil conservation
measures can first be applied to these sub watersheds first depending upon the priority.
With the help of ArcGIS software, 9 thematic layers viz
drainage density, lineament density,
to pographic wetness index, slope, geomorphology, geology, soil texture, land use/cover and rainfall
distribution were prepared. The weighted index overlay analysis technique was used to overlay these layers.
From the results it was concluded that morphometri c analysis could be an effective methodology for
identifying the erosion susceptible regions. Results indicated that, out of total area of 673.52 km 2 , 106.55
km 2 (15.81%) and 4.11 km 2 (0.63%) area have good and very good potential of groundwater respectively.
The results were validated with observed groundwater level data of wells using ROC curve. The area under the curve for AHP was found to be 75%. Based on the ROC curve analysis, it was concluded that AHP approach produced reliable results. It was also revealed from the study that accuracy of these approaches ultimately depends on the criteria of classification and weights assigned to the thematic layers.
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Theses of M. Tech