https://scholars.lib.ntu.edu.tw/handle/123456789/598521
Title: | Analytical One-Dimensional Conceptual Model of Channel Evolution After Dam Removal Based on Diffusion Framework | Authors: | Chu C.-C You G.J.-Y. JIING-YUN YOU |
Keywords: | analytic solution;channel evolution;dam removal;diffusion equation;knickpoint migration;sediment volume;Sediments;Analytical results;Conceptual model;Diffusion equations;Infinite channels;Intermediate periods;One-dimensional channels;Quantitative prediction;Sediment volumes;Dams;channel change;conceptual framework;diffusion;Fourier transform;one-dimensional modeling;sediment transport;volume change;Taiwan | Issue Date: | 2021 | Journal Volume: | 57 | Journal Issue: | 5 | Source: | Water Resources Research | Abstract: | In assessing the removal of dams, it is important to consider the degree to which these efforts could affect channel evolution. A number of previous studies have analyzed the problem of channel evolution using frameworks based on the diffusion equation. In this study, we adopted a similar analytical framework to examine one-dimensional channel evolution within an infinite channel following dam removal. The Fourier transform is used to obtain an analytical solution which is further used to determine the volume of sediment and position of knickpoints. Analytical results obtained using the proposed models were compared with experiment results reported by Cantelli et?al.?(2004), https://doi.org/10.1029/2003wr002940 and in-situ data related to the Balin dam break in Taiwan. We determined that the rate of sediment volume change is proportional to (Formula presented.) in the early period and (Formula presented.) in the intermediate period, before eventually decreasing to nearly zero. The proposed solution also makes it possible to derive qualitative and quantitative predictions pertaining to bed elevation, sediment volume, and knickpoint positions. ? 2021. American Geophysical Union. All Rights Reserved. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85106736264&doi=10.1029%2f2020WR028306&partnerID=40&md5=b8d619e847ad9cf0a4bc26b92c87bb35 https://scholars.lib.ntu.edu.tw/handle/123456789/598521 |
ISSN: | 00431397 | DOI: | 10.1029/2020WR028306 |
Appears in Collections: | 土木工程學系 |
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