• Prahlad Kumar Arya
• Anil Kumar

River erosion is one of the significant and unpredictable hazards in India. Soil that forms over hundreds of years depletes due to various geological phenomena and anthropogenic causes. Assessment of the vulnerable area is essential to take any remedial measures to control river erosion. Remote sensing and Geographical Information System techniques can be effectively utilized to assess the severity level of erosion as realistic as possible. Hydrological parameters can be calculated by using the Geographical Information System. We have processed the Digital Elevation Models in the Geographical Information System of the study area to calculate the important hydrological indices i.e., Topographic Wetness Index, Sediment Transport Index, Stream Power Index and slope gradients along with other relevant parameters. The erosion-susceptible areas are delineated based on variability found in the Sediment Transport Index, Stream Power Index, Topographic Wetness Index and Slope Gradient of the study area. An Erosion Hazard Vulnerability map of parts of the Gandak river basin in Bihar which is the study area has been prepared based on the Weighted method of Geographic Information System. The results of the hydrological parameters show a gentle slope in the study area which is prone to erosion. River bank erosion occurs due to very high river water flow, especially in the monsoon season, and river channel shifts due to heavy siltation. The spatial tools of the Geographic Information System have been used to demarcate the erosion susceptible areas. These maps can be used to prepare ourselves for flood hazards and to manage natural resources more effectively.

Soil Erosion; Slope; Sediment Transport Index; Stream Power Index; Topographic Wetness Index

"Application of hydrological indices in developing erosional hazard vulnerability map in parts of the Gandak River Basin, Bihar", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.11, Issue 3, page no.k135-k148, March-2024, Available :http://www.jetir.org/papers/JETIR2403A16.pdf

"Application of hydrological indices in developing erosional hazard vulnerability map in parts of the Gandak River Basin, Bihar", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.11, Issue 3, page no. ppk135-k148, March-2024, Available at : http://www.jetir.org/papers/JETIR2403A16.pdf