Determining the Flood Control Level of Small Reservoirs with Fuzzy Decision by Stages

2013 ◽  
Vol 838-841 ◽  
pp. 1753-1758
Author(s):  
Zhi Qi Liu ◽  
Jin Xi Lu ◽  
Jian Jiao ◽  
Qing Zhang
Keyword(s):  
Water Resources ◽  
Water Level ◽  
Flood Control ◽  
Control Level ◽  
Economic Benefits ◽  
Fuzzy Decision ◽  
Small Reservoir ◽  
Flood Season ◽  
Precipitation Characteristics ◽  
Average Annual Precipitation

The limited water level of reservoir by stage, fully consider the seasonal variations of the average annual precipitation characteristics in every reservoirs control catchment. Its not only ensuring the rational use of water resources, increasing economic and social benefits to the reservoir, but also ensuring the safety of flood control reservoir flood season, to protect people's lives and property. Determine flood limit level for small reservoir by installments should consider the balance between the economic benefits from improving the water level and the consumption of human and financial resources caused by the installments flood water level adjustment. At the same time, the water resources should be intelligent used in order to let the level of reservoir get in normal. This paper, according to the characteristics of small reservoir, calculated on the reservoir storage capacity can be increased basis of the existing flood control capacity through calculating the value of membership function during reservoir flood season. So that the new limited water level can be obtained after calculating the reservoir capacity increase according to the capacity-water level graph.

Study on Flood Pre-Discharged Rule-Making for Xihe Reservoir Flood Control

2013 ◽  
Vol 864-867 ◽  
pp. 2428-2432
Author(s):  
Zhao Liu ◽  
Qing Wang ◽  
Qiu Yi Xi ◽  
Zhi Feng Jia ◽  
Chun Yan Xu
Keyword(s):  
Power Generation ◽  
High Risk ◽  
Water Level ◽  
Reservoir Operation ◽  
Flood Control ◽  
Control Level ◽  
Hydropower Station ◽  
Flood Season ◽  
Rule Application ◽  
Rule Making

In order to increase power generation of hydropower station,a higher flood control level was favorable for most of the hydropower station in flood season,but this could bring about high risk for reservoir operation sometimes.Taken Xihe reservoir for example in this paper,by analyzing the long series of the flood characters on damsite,storage and discharge capability of the reservoir,a feasible flood control level was put forward in the premise of ensuring flood control safety.Moreover,the pre-discharged rule was figured out on the basis of formulated pre-discharged index,pre-discharged flow and scheme comparison, finally, the safety of the rule application was confirmed by flood routing.It is expected that more power could be generated in flood season as a result of risen water level before the dam.

scholarly journals Optimal Operation of Floodwater Resources Utilization of Lakes in South-to-North Water Transfer Eastern Route Project

2021 ◽  
Vol 13 (9) ◽  
pp. 4857
Author(s):  
Zitong Yang ◽  
Xianfeng Huang ◽  
Jiao Liu ◽  
Guohua Fang
Keyword(s):  
Water Level ◽  
Resource Utilization ◽  
Flood Control ◽  
Optimal Operation ◽  
Water Transfer ◽  
Water Levels ◽  
Reservoir Storage ◽  
Flood Season ◽  
Hongze Lake ◽  
North Water

In order to meet the demand of emergency water supply in the northern region without affecting normal water transfer, considering the use of the existing South-to-North Water Transfer eastern route project to explore the potential of floodwater resource utilization in the flood season of Hongze Lake and Luoma Lake in Jiangsu Province, this paper carried out relevant optimal operating research. First, the hydraulic linkages between the lakes were generalized, then the water resources allocation mode and the scale of existing projects were clarified. After that, the actual available amount of flood resources in the lakes was evaluated. The average annual available floodwater resources in 2003–2017 was 1.49 billion m3, and the maximum available capacity was 30.84 billion m3. Then, using the floodwater resource utilization method of multi period flood limited water levels, the research period was divided into the main flood season (15 July to 15 August) and the later flood season (16 August to 10 September, 11 September to 30 September) by the Systematic Clustering Analysis method. After the flood control calculation, the limited water level of Hongze Lake in the later flood season can be raised from 12.5 m to 13.0 m, and the capacity of reservoir storage can increase to 696 million m3. The limited water level of Luoma Lake can be raised from 22.5 m to 23.0 m (16 August to 10 September), 23.5 m (11 September to 30 September), and the capacity of reservoir storage can increase from 150 to 300 million m3. Finally, establishing the floodwater resource optimization model of the lake group with the goals of maximizing the floodwater transfer amount and minimizing the flood control risk rate, the optimal water allocation scheme is obtained through the optimization algorithm.

scholarly journals Research on Water Environment Regulation of Artificial Playground Lake Interconnected Yangtze River

2018 ◽  
Vol 15 (10) ◽  
pp. 2110 ◽  
Author(s):  
Weiwei Song ◽  
Xingqian Fu ◽  
Yong Pang ◽  
Dahao Song ◽  
Qing Xu ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Level ◽  
Yangtze River ◽  
Flood Control ◽  
Numerical Models ◽  
Rapid Development ◽  
Control Level ◽  
Water Environment ◽  
Water Diversion ◽  
Coupled Models

With the rapid development of China, water pollution is still a serious problem despite implementation of control measures. Reasonable water environment management measures are very important for improving water quality and controlling eutrophication. In this study, the coupled models of hydrodynamics, water quality, and eutrophication were used to predict artificial Playground Lake water quality in the Zhenjiang, China. Recommended “unilateral” and “bilateral” river numerical models were constructed to simulate the water quality in the Playground Lake without or with water diversion by pump, sluice and push pump. Under “unilateral” and “bilateral” river layouts, total nitrogen and total phosphorus meet the landscape water requirement through water diversion. Tourist season in spring and summer and its suitable temperature result in heavier eutrophication, while winter is lighter. Under pumping condition, water quality and eutrophication of “unilateral” river is better than “bilateral” rivers. Under sluice diversion, the central landscape lake of “unilateral river” is not smooth, and water quality and eutrophication is inferior to the “bilateral”. When the water level exceeds the flood control level (4.1 m), priority 1 is launched to discharge water from the Playground Lake. During operation of playground, when water level is less than the minimum level (3.3 m), priority 2 is turned on for pumping diversion or sluice diversion to Playground Lake. After opening the Yangtze river diversion channel sluice, priority 3 is launched for sluice diversion to the Playground Lake. When the temperature is less than 15 °C, from 15 °C to 25 °C and higher than 25 °C, the water quality can be maintained for 15 days, 10 days and 7 days, respectively. Corresponding to the conditions of different priority levels, reasonable choices of scheduling measures under different conditions to improve the water quality and control eutrophication of the Playground Lake. This article is relevant for the environmental management of the artificial Playground Lake, and similar lakes elsewhere.

scholarly journals Exploring The Viability of Dams is Key to Malaysian Water Resources Development of the Future

2015 ◽  
Vol 76 (1) ◽  
Author(s):  
Dato’ Ir. Syed Muhammad Shahabudin
Keyword(s):  
Water Resources ◽  
Flood Control ◽  
River Flow ◽  
Economic Benefits ◽  
Conservation Strategies ◽  
Water Resources Development ◽  
The Public ◽  
The Future ◽  
Control Water ◽  
Resources Development

It is said tluit civilization began and prospered when humans could control water; and that same civilization declined and vanished when that control is lost. Dams and other river flow barriers were built to harness and control water in the early days of civilisation in order to secure the benefits for human basic needs and comfort. Centuries later, more dams were built to cater for increasing population, especially in arid and semi-arid areas. But it is really in the past two centuries that many large-sized dams have been built to satisfy a wider range of development demands — hydropower, treated water supply, irrigation, flood control and environmental needs.Towards the second half of the last century, society came to realise that dams can cause significant negative social and environmental impacts that could outweigh the original economic benefits. Opponents of dams protest vehemently world-wide against the development of more dams whilst proponents are convinced tluit the y are a necessary feature to support growth and prosperity. It is these contradicting beliefs in mind tluit the public must be engaged to facilitate a better understanding of the views of both the proponents and the opponents of dam development before deciding on a long-term strateg y. In the meantime, more effort may have to be made for water and energ y conservation strategies and to realize the potential applications of low impact and non-structural solutions that complement existing dams and defer new dam development to as far into the future as possible.This paper aims to provoke a critical debate amongst engineers and the public to look at the longer term future ofdams in water resources development that could possibl y reduce the fundamental demand for services that dam provides. In other words, to try and answer the question “Why should a country rich in water, as Malaysia is, need to construct dams and even plan for more?”

scholarly journals Research and Application of Key Technologies for Dynamic Control of Reservoir Water Level in Flood Season

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3576
Author(s):  
Jun Zhang ◽  
Yaowu Min ◽  
Baofei Feng ◽  
Weixin Duan
Keyword(s):  
Water Supply ◽  
Water Level ◽  
Real Time ◽  
Flood Control ◽  
Dynamic Control ◽  
Water Levels ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Danjiangkou Reservoir ◽  
Flood Season

In today’s reservoir operation study, it is urgent to solve the issues on improving flood resource utilization, maximizing reservoir impoundment, and guaranteeing water supply through real-time regulation optimization under the premise of ensuring flood control safety and taking risks properly. Based on previous studies, the key real-time operation technologies for dynamic control of reservoir water levels in flood season are summarized. The Danjiangkou Reservoir was taken as an example, the division of flood stages, reservoir water level requirements for improving water supply guarantee, dynamic control indexes of reservoir water level for beneficial use in stages during the flood season, and flood control dispatching indexes are proposed. Moreover, a practicable real-time flood forecast operation scheme for Danjiangkou Reservoir was compiled. Its application in 2017 indicated that the established scheme can provide strong technical support to ensure the overall benefits of Danjiangkou Reservoir, including flood control, water supply, and power generation.

scholarly journals Dynamic change of water level in flood season and sediment regulation in the Three Gorges Reservoir

2018 ◽  
Vol 246 ◽  
pp. 01116
Author(s):  
Man Zhou ◽  
Yangfan Xiao ◽  
Chunming Fang ◽  
Ting Hu
Keyword(s):  
Water Level ◽  
Flood Control ◽  
Dynamic Change ◽  
Flood Season ◽  
Capacity Loss ◽  
Water And Sediment ◽  
Reservoir Siltation ◽  
Sedimentation Volume ◽  
Sediment Reduction ◽  
And Storage

Based on the operation requirements of flood control, navigation, power generation, flood resource utilization and sediment reduction, this paper developed the schemes with dynamic change of water level at different periods in flood season, and focused on the response relationship between the different schemes with dynamic change of water level in flood season and the change of sediment erosion under the new water and sediment and the measured water and sediment conditions. The results indicate that the total sedimentation volume and the sedimentation volume above elevation 145m are basically about twice that of the new water and sediment series, since the amount of sand entering the reservoir in 2003-2012 is basically twice that of the new flow water and sediment series. Regardless of the type of water and sediment series, the scheme with dynamic change of water level is better than the preliminary design expectation in terms of reservoir siltation and storage capacity loss.

scholarly journals Combined Dispatching of Hydropower and Wind Power Based on the Hedging Theory

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1319
Author(s):  
Kaoshe Zhang ◽  
Mengyan Xie ◽  
Gang Zhang ◽  
Tuo Xie ◽  
Xin Li ◽  
...  
Keyword(s):  
Decision Making ◽  
Water Resources ◽  
Water Level ◽  
Wind Power ◽  
Flood Control ◽  
Water Storage ◽  
Utilization Rate ◽  
Water Storage Capacity ◽  
Time Period ◽  
Control Risk

In order to improve the utilization rate of water resources in the flood season of the reservoir effectively and promote wind power consumption, this paper proposes an optimization model for the combined dispatching of wind power and hydropower based on the hedging theory. First, the conflicting relationship between the water storage benefits of hydropower stations, flood control risks, and the joint output of hydropower and wind power in joint dispatching is studied. The introduction of hedging theory divides the combined dispatching of wind power and hydropower into a two-stage dispatching problem including the decision-making stage and the remaining stage; Second, considering the uncertainty of water forecasting and wind power forecasting, a multi-objective optimal dispatching model of hydropower and wind power based on hedging theory is constructed. This model aims to minimize flood control risks, maximize water storage benefits, and minimize wind power and hydropower combined power output volatility. Finally, the non-dominated sorting genetic algorithm (NSGA2) is used to solve the specific examples. The results show that the model built in the article controls the flood control risk at each time period not to be higher than 1.63 × 10−3 (the flood control standard corresponding to the flood control risk in 50 years is 0.006). Additionally, the water level of the reservoir increased from the flood limit water level (583.00 m) to 583.70 m. It greatly increases the water storage capacity and effectively improves the utilization rate of water resources. At the same time, the optimized scheduling scheme reduced the peak-valley difference of joint output from 125.00 MW to 35.66 MW, and the peak-valley difference was greatly reduced. It effectively improves the volatility of wind power. The validity of the model is verified, and the obtained scheme can provide decision-making for the joint dispatch scheme of hydropower and wind power.

scholarly journals Optimal operation of Hoa Binh reservoir for flood control on Hong-Thai Binh river system

2008 ◽  
Vol 30 (3) ◽  
Author(s):  
Ngo Huy Can ◽  
Nguyen Thanh Don ◽  
Nguyen Hong Phong ◽  
Nguyen Tuan Anh ◽  
Nguyen Van Que
Keyword(s):  
Water Level ◽  
Flood Control ◽  
River System ◽  
Optimal Operation ◽  
Flood Season ◽  
The Mean ◽  
Hoa Binh

In the paper the optimal operation of Hoabinh reservoir for flood control on Hong–Thai Binh river system is presented. The findings show that in the flood season in 1996 if the operation of gates and outlets of Hoa Binh reservoir was made base on the calculated release, the water level at Hanoi would be 12.3 m and the water level of Hoa Binh reservoir would be 98 m. So the calculated release from Hoabinh reservoir in August 1996 can be considered as optimal in the mean that the water level at Hanoi can be controlled and the Hoabinh reservoir still have necessary pool for controlling the next floods.

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