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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/nhess-2019-236
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2019-236
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 25 Jul 2019

Submitted as: research article | 25 Jul 2019

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Study on Flood Control Safety Evaluation Based on Composite Risk Model

Yingying Lan1, Faliang Gui1, Dongnan Luo1, Youqin Zou2, and Hua Bai1 Yingying Lan et al.
  • 1Academy of Hydraulic and Ecology Engineering, Nanchang Institute of Technology, Nanchang, 330099, Jiangxi, China
  • 2School of Resources, Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, Jiangxi, China

Abstract. The process of dam design up to the management of dam operation involves many uncertain factors, such as hydrologic, hydraulic and flood control factors, which cause risks for the flood control safety of dams. This study presents an integrated probabilistic framework that combines Monte Carlo Simulation and a flood control risk model. Results show that the highest flood level of 1000-year return periods of the Zhelin Reservoir exceeds the designed flood level. However, the overtopping risk probability is small because super safe elevation is considered in the crest elevation design of the earth dam. Sensitivity analysis indicates that flood peak flow, line type hydrological factors and flood control level are more sensitive than hydraulic factors. When many factors are considered, the comprehensive risk rate is small because of the positive and negative effects of these factors. Numerical experiments indicate that hydrology and flood control level influence the estimated maximum water level more than hydraulics does. Because of these uncertain factors, it is necessary to consider super safe elevation in dam planning and design. And pay attention to the sensitive factor of flood control level in reservoir management and operation.

Yingying Lan et al.
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Short summary
The Zhelin Reservoir construction has a long history and the designing data was insufficient. Its safety is particularly important because of large scale. Whether a risk of flood control safety exists in the reservoir should be evaluated. This study presents an integrated probabilistic framework that combines Monte Carlo Simulation and a flood control risk model. This model involves many uncertain factors and sensitivity are analyzed. Technical guidance are provided for reservoir flood control.
The Zhelin Reservoir construction has a long history and the designing data was insufficient....
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