Geospatial and fluvio-geomorphological investigation of confluence dynamics of river Raidak within Himalayan foreland basin, India

IF 1.1 4区地球科学 Q4 ENVIRONMENTAL SCIENCES

Physical Geography Pub Date : 2022-04-21 DOI:10.1080/02723646.2022.2068405

Supriya Ghosh, Prasanta Mandal, B. Bera

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引用次数: 7

Abstract

ABSTRACT Confluence of river channels plays a significant role in channel avulsion, flood plain evolution and dynamics of the fluvial system. The principal objectives of the present study are (i) to analyze the direction and degree of confluence shifting through the recent past (1955–2020) by applying geospatial techniques and (ii) to find out the probable causes of confluence dynamics of the Raidak river system within quaternary geological sites of a Himalayan foreland basin in West Bengal, India, applying fluvio-geomorphological and sedimentary bank facies. Modified Normalized Difference Water Index method is also used. The result shows that the Raidak-Sankosh confluence (RSC) shifted by 9.94 km of the total distance between 1955 and 2020, whereas Raidak-I-Torsa confluence (RTC) has shifted 4.29 km overall distance during the same period. Both confluences were shifted toward the south and south-east directions. Total erosion and accretion area at the proximity of RSC and RTC has been registered as 40.1 sq km and 47.57 sq km and 39.67 sq km and 37.99 sq km, respectively, for the 65-year period. The key factors of confluence dynamics are regular flood events and channel avulsion, non-cohesive bank materials and huge channel bed sedimentation with multiple bars.

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印度喜马拉雅前陆盆地Raidak河汇流动力学的地理空间和河流地貌研究

摘要河道汇流在河道撕裂、洪泛平原演变和河流系统动力学中起着重要作用。本研究的主要目的是：（i）通过应用地理空间技术分析最近（1955年至2020年）汇流转移的方向和程度；（ii）找出印度西孟加拉邦喜马拉雅前陆盆地第四纪地质点内Raidak河系统汇流动力学的可能原因，应用河流地貌和沉积岸相。还使用了改进的归一化差分水分指数方法。结果表明，1955年至2020年间，Raidak-Sankosh汇流处（RSC）移动了9.94公里的总距离，而Raidak-I-Torsa汇流处（RTC）在同一时期移动了4.29公里。两处交汇处都向南方和东南方向转移。在65年的时间里，RSC和RTC附近的总侵蚀和吸积面积分别为40.1平方公里和47.57平方公里，39.67平方公里和37.99平方公里。汇流动力学的关键因素是有规律的洪水事件和河道撕裂、非粘性河岸材料和具有多个坝的巨大河床沉积。

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来源期刊

Physical Geography 地学-地球科学综合

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

6 months

期刊介绍： Physical Geography disseminates significant research in the environmental sciences, including research that integrates environmental processes and human activities. It publishes original papers devoted to research in climatology, geomorphology, hydrology, biogeography, soil science, human-environment interactions, and research methods in physical geography, and welcomes original contributions on topics at the intersection of two or more of these categories.