Evaluating Uncertainty in Fluvial Geomorphic Response to Dam Removal

Yuan Heng Wang; Chia Chu Chu; Gene Jiing Yun You; Hoshin V. Gupta; Peng Hao Chiu

doi:10.1061/(ASCE)HE.1943-5584.0001917

Evaluating Uncertainty in Fluvial Geomorphic Response to Dam Removal

Yuan Heng Wang, Chia Chu Chu, Gene Jiing Yun You, Hoshin V. Gupta, Peng Hao Chiu

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Dam removal tends to produce a series of changes in river morphology. Whereas decisions pertaining to dam removal are typically evaluated from a deterministic viewpoint, this study develops a stochastic framework for assessing the effects of hydrological variability on morphological changes in river channels resulting from dam removal. Our approach yields probability distributions for channel responses that can be used in decision-making. Application of the framework to the 25-m-tall Shihgang Dam on the Dajia River in central Taiwan reveals that the area most geomorphically sensitive to removal of the dam lies 1,200-3,600 m downstream of the dam site. We also investigate the influence of flow regime on geomorphic response using indicators of hydrologic alteration (IHA) and find that higher flows result in more pronounced channel evolution and greater thalweg migration.

Original language	English (US)
Article number	04020022
Journal	Journal of Hydrologic Engineering
Volume	25
Issue number	6
DOIs	https://doi.org/10.1061/(ASCE)HE.1943-5584.0001917
State	Published - Jun 1 2020
Externally published	Yes

Keywords

Dam removal
Geomorphic response
Meandering
Stochastic framework
Synthetic flow
Two-dimensional (2D) hydraulic sedimentation model

ASJC Scopus subject areas

Environmental Chemistry
Civil and Structural Engineering
Water Science and Technology
General Environmental Science

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10.1061/(ASCE)HE.1943-5584.0001917

Cite this

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title = "Evaluating Uncertainty in Fluvial Geomorphic Response to Dam Removal",

abstract = "Dam removal tends to produce a series of changes in river morphology. Whereas decisions pertaining to dam removal are typically evaluated from a deterministic viewpoint, this study develops a stochastic framework for assessing the effects of hydrological variability on morphological changes in river channels resulting from dam removal. Our approach yields probability distributions for channel responses that can be used in decision-making. Application of the framework to the 25-m-tall Shihgang Dam on the Dajia River in central Taiwan reveals that the area most geomorphically sensitive to removal of the dam lies 1,200-3,600 m downstream of the dam site. We also investigate the influence of flow regime on geomorphic response using indicators of hydrologic alteration (IHA) and find that higher flows result in more pronounced channel evolution and greater thalweg migration.",

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author = "Wang, {Yuan Heng} and Chu, {Chia Chu} and You, {Gene Jiing Yun} and Gupta, {Hoshin V.} and Chiu, {Peng Hao}",

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AU - Chu, Chia Chu

AU - You, Gene Jiing Yun

AU - Gupta, Hoshin V.

AU - Chiu, Peng Hao

N1 - Funding Information: The authors would like to acknowledge the financial support for this paper provided by the Ministry of Science and Technology, Taiwan (MOST-104-2625-M-009-001-and MOST-105-2625-M-002-013-). Publisher Copyright: © 2020 American Society of Civil Engineers.

PY - 2020/6/1

Y1 - 2020/6/1

N2 - Dam removal tends to produce a series of changes in river morphology. Whereas decisions pertaining to dam removal are typically evaluated from a deterministic viewpoint, this study develops a stochastic framework for assessing the effects of hydrological variability on morphological changes in river channels resulting from dam removal. Our approach yields probability distributions for channel responses that can be used in decision-making. Application of the framework to the 25-m-tall Shihgang Dam on the Dajia River in central Taiwan reveals that the area most geomorphically sensitive to removal of the dam lies 1,200-3,600 m downstream of the dam site. We also investigate the influence of flow regime on geomorphic response using indicators of hydrologic alteration (IHA) and find that higher flows result in more pronounced channel evolution and greater thalweg migration.

AB - Dam removal tends to produce a series of changes in river morphology. Whereas decisions pertaining to dam removal are typically evaluated from a deterministic viewpoint, this study develops a stochastic framework for assessing the effects of hydrological variability on morphological changes in river channels resulting from dam removal. Our approach yields probability distributions for channel responses that can be used in decision-making. Application of the framework to the 25-m-tall Shihgang Dam on the Dajia River in central Taiwan reveals that the area most geomorphically sensitive to removal of the dam lies 1,200-3,600 m downstream of the dam site. We also investigate the influence of flow regime on geomorphic response using indicators of hydrologic alteration (IHA) and find that higher flows result in more pronounced channel evolution and greater thalweg migration.

KW - Dam removal

KW - Geomorphic response

KW - Meandering

KW - Stochastic framework

KW - Synthetic flow

KW - Two-dimensional (2D) hydraulic sedimentation model

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Evaluating Uncertainty in Fluvial Geomorphic Response to Dam Removal

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Keywords

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