An Estimation Method of Monthly Lower Limit Water Level for Firm Supply Discharge in Multi-Purpose Reservoirs

2000 ◽  
Author(s):  
Kyung-Seok Kang ◽  
Byung-Ha Seoh ◽  
Hung Soo Kim
Keyword(s):  
Water Level ◽  
Lower Limit ◽  
Estimation Method ◽  
Limit Water Level

scholarly journals Inter-annual change of the drought limit water level of a reservoir based on system dynamics

Water Policy ◽  
2018 ◽  
Vol 21 (1) ◽  
pp. 91-107 ◽  
Author(s):  
Fawen Li ◽  
Dong Yu ◽  
Yong Zhao ◽  
Runxiang Cao
Keyword(s):  
Water Supply ◽  
System Dynamics ◽  
Water Level ◽  
Water Levels ◽  
Disaster Mitigation ◽  
Structural Diagram ◽  
Yuqiao Reservoir ◽  
Engineering Measure ◽  
Drought Early Warning ◽  
Limit Water Level

Abstract Drought is one of the major natural disasters affecting the development of economies and society. Drought early warning is the primary step and most important non-engineering measure for drought relief. This paper took Yuqiao Reservoir in Tianjin as a case study and analysed inter-annual changes of the drought limit water level. First, the causality between variables in the water supply–demand system was analysed, and a structural diagram of water sources allocation was drawn. Coupled with the parameters and a structural diagram, a system dynamics (SD) model of the water supply volume was established. Secondly, simulation results were tested to ensure that the model was valid. The water supply volume from 2003 to 2020 was simulated by using the model. Finally, based on the inflow process and the water supply volume, the drought limit water level was calculated. The results showed the water supply volume of Yuqiao Reservoir has changed remarkably. The drought limit water levels in 2003–2012 and in 2016–2020 were 16.70 m and 16.30 m, respectively: a difference of 0.40 m. The regulation curve of guarantee for water supply during 2016–2020 is significantly lower than that of 2003–2012. This research is of great significance for drought resistance, disaster mitigation and reservoir management.

Dynamic Regulation of Reservoir Drought Limit Water Level

2021 ◽  
Vol 48 (2) ◽  
pp. 194-203
Author(s):  
Runxiang Cao ◽  
Fawen Li ◽  
Yong Zhao
Keyword(s):  
Water Level ◽  
Dynamic Regulation ◽  
Limit Water Level

Life Prediction of Hull Based on Weibull Distribution

2011 ◽  
Vol 317-319 ◽  
pp. 2325-2330
Author(s):  
Jin Long Guo ◽  
Yan You Chai ◽  
Yang Han ◽  
Hao Zhang
Keyword(s):  
Weibull Distribution ◽  
Life Span ◽  
Lower Limit ◽  
Life Prediction ◽  
Estimation Method ◽  
Engineering Application ◽  
Shape Parameters ◽  
Life Estimation ◽  
Failure Data ◽  
The Relationship

In order to research the relationship between the life of hull with different structure and the reliability while using, a life estimation method for hull based on test was proposed. By assuming that the hull life span satisfied the Weibull distribution, with zero-failure data, confidence limit γ and reliability R, the confidence lower limit of reliable life were given according to test data of the hull life span. If the lower limit of the shape parameters of the Weibull distribution were known, this method can accumulate all of zero-failure data to increase the analysis presion of reliability greatly. At last, using this method, under the hull reliability R and the confidence γ, the confidence lower limit of reliable life with the hull structures as steel, titanium alloy and aluminum alloy were computed. The results indicate that the method is easy to compute and very convenient for engineering application.

Optimal Design for Flood Limit Water Level of Cascade Reservoirs

2014 ◽  
Vol 29 (2) ◽  
pp. 445-457 ◽  
Author(s):  
Shuo Ouyang ◽  
Jianzhong Zhou ◽  
Chunlong Li ◽  
Xiang Liao ◽  
Hao Wang
Keyword(s):  
Optimal Design ◽  
Water Level ◽  
Cascade Reservoirs ◽  
Limit Water Level

Application of Robust Estimation Method in Study of Relationship Between Lake’s Water Area and Water Level

2018 ◽  
Vol 46 (10) ◽  
pp. 1595-1603
Author(s):  
Jie Lv ◽  
Junhuan Peng ◽  
Dezhao Zhang ◽  
Hui Zhao ◽  
Bin Li
Keyword(s):  
Water Level ◽  
Robust Estimation ◽  
Estimation Method ◽  
Water Area
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