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Vol.50, No.4, PP.131-182
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Simple One-Dimensional Dam Breach and Flood Route Models for Tributary-Dammed Lake: A Case Study of the Laonong River in Southern Taiwan
Tzu-Yin Chen[1] Chi-Yao Hung[2]*
* Corresponding Author. E-mail :
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Simple One-Dimensional Dam Breach and Flood Route Models for Tributary-Dammed Lake: A Case Study of the Laonong River in Southern Taiwan
Tzu-Yin Chen[1] Chi-Yao Hung[2]*

Due to numerous landslides caused by Typhoon Morakot in 2009, much loose sediment was deposited in the upper reach of the tributary of Laonong River. Loose material was transported into the main stream during the heavy rainfall of the typhoon and formed a tributary-dammed lake. If the dam were to fail, this would pose a significant threat to downstream villages. In this research, we present a diffusion equation–based one-dimensional semianalytical
model of a tributary-dammed lake breach. To estimate the most dangerous scenario, the model incorporates the intense
discharge caused by torrential precipitation during typhoons. To assess the security of downstream villages, the floods are routed by a one-dimensional kinematic wave solution for a nonuniform valley. The solution can simulate areas impacted by flooding with much reduced computational cost and topographical data requirements. Finally, the research applies combined methods to the tributary-dammed lake at the confluence of the Putunpunas tributary river with the Laonong River. The maximum flood elevation of the dam was estimated for breach floods under different scenarios.
Key Words: tributary-dammed lake, breaching model, kinematic wave model
〔1〕Department of Civil Engineering, National Taiwan University, Taipei, Taiwan, R.O.C.
〔2〕Department of Soil and Water Conservation, National Chung Hsing University, Taichung, Taiwan, R.O.C.
* Corresponding Author. E-mail :
Received: 2019/09/09
Revised: 2019/10/01
Accepted: 2019/10/30
Constructing Approximated Three-Dimensional Fracture Surfaces of Deep- Seated Landslides by Using Volume Constraints and Smooth Minimal Surfaces
Chih-Yu Kuo [1] Ya-Hsin Chan [1] * Pi-Wen Tsai [2] Rou-Fei Chen [3] Yih-Chin Tai [4] Ching-Weei Lin [5]
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Formation and Dam Breach Analysis of the 2018 Hokkaido Iburi- Tobu Earthquake–Induced Landslide Dam in Atsuma Town, Japan
Chen-Yu Wu[1]* Chia-Hsing Lin[1][2] Chen-Yu Chen[1] Kuo-Wei Chen[1]
* Corresponding Author. E-mail :
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Multilevel Governance to Integrate Climate Change Adaptation and Disaster Risk Reduction Policies: a Large-Scale Landslide Area in Shi-Ding District, New Taipei City as an Example
Chin-Yu He[1]* Ching-Pin Tung[1] Chin-Lun Wang[2] Yong-Jun Lin[3]
* Corresponding Author. E-mail :
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