Controls on morphological variability and role of stream power distribution pattern, Yamuna River, western India

被引:40
|
作者
Bawa, Nupur [1 ]
Jain, Vikrant [1 ,2 ]
Shekhar, Shashank [1 ]
Kumar, Niraj [1 ]
Jyani, Vikas [1 ]
机构
[1] Univ Delhi, Dept Geol, Ctr Adv Studies, Delhi 110007, India
[2] Indian Inst Technol Gandhinagar, Discipline Earth Sci, Ahmadabad 382424, Gujarat, India
关键词
Channel morphology; Geomorphic threshold; Anthropogenic impact on rivers; Stream power; Maximum flow efficiency; Yamuna River; India; NEW-SOUTH-WALES; CHANNEL PATTERNS; SPATIAL VARIABILITY; DOWNSTREAM CHANGES; THRESHOLDS; CATCHMENT; TRENDS; SRTM; FLOW; CLASSIFICATION;
D O I
10.1016/j.geomorph.2014.05.016
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Understanding the controls on the morphological variability of river systems constitutes one of the fundamental questions in geomorphic investigation. Channel morphology is an important indicator of river processes and is of significance for mapping the hydrology-ecologic connectivity in a river system and for predicting the future trajectory of river health in response to external forcings. This paper documents the spatial morphological variability and its natural and anthropogenic controls for the Yamuna River, a major tributary of the Ganga River, India. The Yamuna River runs through a major urban centre i.e. Delhi National Capital Region. The Yamuna River was divided into eight geomorphically distinct reaches on the basis of the assemblages of geomorphic units and the association of landscape, valley and floodplain settings. The morphological variability was analysed through stream power distribution and sediment load data at various stations. Stream power distribution of the Yamuna River basin is characterised by a non-linear pattern that was used to distinguish (a) high energy 'natural' upstream reaches, (b) 'anthropogenically altered', low energy middle stream reaches, and (c) 'rejuvenated' downstream reaches again with higher stream power. The relationship between stream power and channel morphology in these reaches was integrated with sediment load data to define the maximum flow efficiency (MFE) as the threshold for geomorphic transition. This analysis supports the continuity of river processes and the significance of a holistic, basin-scale approach rather than isolated local scale analysis in river studies. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:60 / 72
页数:13
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