Channel responses to flooding of Ganga River, Bihar India, 2019 using SAR and optical remote sensing

被引:12
|
作者
Khan, Armugha [1 ]
Govil, Himanshu [2 ]
Khan, Haris Hasan [3 ]
Thakur, Praveen Kumar [4 ]
Yunus, Ali P. [5 ]
Pani, Padmini [6 ]
机构
[1] Aligarh Muslim Univ, Dept Geol, Aligarh 202002, Uttar Pradesh, India
[2] Natl Inst Technol, Dept Appl Geol, Chhattisgarh 492010, India
[3] Aligarh Muslim Univ, Interdisciplinary Dept Remote Sensing & GIS Appli, Aligarh 202002, Uttar Pradesh, India
[4] Indian Inst Remote Sensing, Water Resources Dept, Dehra Dun 248001, Uttarakhand, India
[5] State Key Lab Geohazard Prevent & Geoenvironm Pro, Chengdu 610059, Peoples R China
[6] Jawaharlal Nehru Univ, Ctr Reg Dev, Sch Social Sci, Delhi 110001, India
关键词
Flooding; Flood depth; Geomorphic changes; Ganga river; Sentinel-1; SAR datasets; GANGETIC PLAINS; ALLUVIAL TRACT; NORTH BIHAR; DYNAMICS; GEOMORPHOLOGY; WETLANDS; INDEX; BASIN; MAP;
D O I
10.1016/j.asr.2021.08.039
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
Indo Gangetic flood plains are subjected to recurring floods due to large low-lying land areas adjacent to major Himalayan Rivers. Recent floods in the Ganga River during the late withdrawal phase of Indian summer monsoon rains in 2019 had reportedly caused death of similar to 200-500 people and damaged major infrastructures in different parts of Bihar state, India. This paper presents a detailed analysis of the spatial extent and temporal pattern of flood inundation areas in Patna district of Bihar using Sentinel-1 Synthetic Aperture Radar (SAR) data. The results obtained using K-means classification show that about 1268 km(2) (20% of the studied portion) of the land area were inundated during the peak flooding conditions on 9th October 2019. The peak flooding lasts for more than 20 days, with a maximum water depth of 18 m in the main river. Owing to the continually changing nature of river morphology by recurring floods, we also analyzed the channel morphology and bar characteristics before, during, and after the floods. Geomorphic change assessment indicates that the total bar occupied area was decreased from 661 km(2) for pre-flood time to 446 km(2) in peak flood time, whereas it retains its original shape in post-flood images. (C) 2021 Published by Elsevier B.V. on behalf of COSPAR.
引用
收藏
页码:1930 / 1947
页数:18
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