Geomorphic assessment of longitudinal profile of the Kanchi river basin, India: Recognition of dynamic equilibrium condition

IF 1.1 4区地球科学 Q4 ENVIRONMENTAL SCIENCES

Physical Geography Pub Date : 2021-09-16 DOI:10.1080/02723646.2021.1978139

Monali Banerjee, Debasish Ghosh, Subhadip Pal, Manas Karmakar

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Abstract

ABSTRACT The Kanchi, an eastward flowing river, traverses through the Ranchi plateau of the Proterozoic Chhotanagpur granite gneissic complex to meet its trunk stream, the Subarnarekha River. The present study analyzed longitudinal profiles and associated geomorphic indices of the Kanchi River and its tributaries to identify spatial variation in profile form and fluvial response to prevailing controls. This work was carried out using a digital dataset and maps, which were processed in a GIS environment to obtain longitudinal profiles, and different data required in best-fit modelling and geomorphic investigation of longitudinal profiles. The analyses indicate that the rivers are in dynamic equilibrium condition. Spatial distribution of geomorphic indices values reveals that longitudinal profile forms vary from one segment to another along river channels, and these irregularities in the form of prominent and minor knickpoints are highly concentrated in middle river basin areas. The absence of lithological variation and active tectonics, and close association of anomalously steep river segments with structural lineaments and landforms demonstrates structural control on river channel development. PCA denotes strong similarities between geomorphic indices. This understanding of longitudinal variation in river nature may help to formulate strategies for the sustainable development and management of river related resources.

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印度Kanchi河流域纵剖面地貌评价:动态平衡条件的认识

坎奇河是一条向东流动的河流，流经元古代Chhotanagpur花岗岩片麻岩杂岩的兰契高原，汇入其干流Subarnarekha河。本研究分析了Kanchi河及其支流的纵向剖面和相关地貌指数，以确定剖面形式的空间变化以及河流对主要控制因素的响应。这项工作是利用数字数据集和地图进行的，这些数据集和地图在GIS环境中进行处理以获得纵剖面，以及最佳拟合建模和纵剖面地貌调查所需的不同数据。分析表明，河流处于动态平衡状态。地貌学指标值的空间分布特征表明，河道纵向剖面形态在不同河段之间存在差异，且这些不规则形态主要集中在中游流域。岩性变化和活动构造的缺失，异常陡峭的河段与构造地貌密切相关，表明构造对河道发育具有控制作用。主成分分析表明地貌指数之间具有很强的相似性。这种对河流性质纵向变化的认识有助于制定河流相关资源的可持续发展和管理战略。

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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.