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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24083

Title: Analysis of geomorphologic and hydrological characteristics in watershed saturated areas using topographic-index threshold and geomorphology-based runoff model
Authors: Chin-Hsin Chang;Kwan Tun Lee
Contributors: NTOU:Department of Harbor and River Engineering
Keywords: partial contributing area;topographic index;geomorphology characteristics;geomorphology-based IUH
Date: 2008-03-15
Issue Date: 2011-10-20T08:10:15Z
Publisher: Hydrological Processes
Abstract: Abstract:The objective of this paper is to investigate the variation of geomorphology and runoff characteristics in saturated areas under different partial contributing area (PCA) conditions. Geomorphologic information and hydrologic records from two mid-size watersheds in northern Taiwan were selected for analysis. The PCA ratio in the watershed during a storm was assumed equal to the ratio of the surface-flow volume to the direct runoff volume from measured hydrologic data. The extents of PCA regions were then determined by using a topographic-index threshold. Consequently, the geomorphologic factors in saturated and unsaturated areas could be calculated using a digital elevation model, and these factors could then be linked to a geomorphology-based IUH model for runoff simulation, which can consider both the surface- and subsurface-flow processes in saturated and unsaturated areas, respectively. The results show that geomorphologic characteristics in the saturated areas vary significantly with different PCA ratios especially for higher order streams. A large PCA ratio results in a sharp hydrograph because the quick surface flow dominates the runoff process, whereas the hydrologic response in a low PCA case is dominated by the delayed subsurface flow. Copyright © 2007 John Wiley & Sons, Ltd.
Relation: 22(6), pp.802-812
URI: http://ntour.ntou.edu.tw/handle/987654321/24083
Appears in Collections:[河海工程學系] 期刊論文

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