scholarly journals Dynamic rule curves for multipurpose reservoir operation for different floods

2019 ◽  
Vol 11 (4) ◽  
pp. 1001-1008
Author(s):  
C. Chaleeraktrakoon ◽  
A. Worawiwat
Keyword(s):  
Climate Change ◽  
Impact Assessment ◽  
Return Period ◽  
Reservoir Operation ◽  
Flood Control ◽  
Peak Discharge ◽  
Operational Performance ◽  
Rule Curves ◽  
Stepwise Manner ◽  
Multipurpose Reservoir

Abstract Dynamic flood control rule curves (DFCRCs) that balance the use of conservation space between flood control and conservation purposes are usually necessary for the operation of a multipurpose reservoir. This paper therefore proposes a procedure to apply the DFCRCs of an historically-based actual flood for reservoir operation versus different floods whose hydrograph shapes vary widely. The proposal uses related-size characteristics (e.g. net retention of the DFCRCs and peak discharge of associated outflows) in a stepwise manner from those of the smallest return period to those of the largest one. Illustrative applications of the procedure to the operation of the multipurpose Ubol Ratana Dam (The Nam Pong Basin, Thailand) have indicated that it enables the DFCRCs to ensure the reservoir's operation against various floods. Its operational results for the large and moderate floods in 1990 and 1995 are comparable to those of historically based floods. In addition, impact assessment of climate change on the operational performance has shown that the system could not protect the areas upstream and downstream of the dam from the HadCM3A2 and HadCM3B2 floods at the 80th and 95th percentile levels during the future 2050s period.

Deriving reservoir operating rules considering ecological demands of multiple stations

2021 ◽  
pp. 1-59
Author(s):  
Chen Wu ◽  
Yibo Wang ◽  
Jing Ji ◽  
Pan Liu ◽  
Liping Li ◽  
...  
Keyword(s):  
Reservoir Operation ◽  
Flood Control ◽  
Optimization Models ◽  
Ecological Indicator ◽  
Generation Model ◽  
Hydropower Generation ◽  
Rule Curves ◽  
Constraints Model ◽  
Operating Rule ◽  
Operating Rule Curves

Reservoirs play important roles in hydropower generation, flood control, water supply, and navigation. However, the regulation of reservoirs is challenged due to their adverse influences on river ecosystems. This study uses ecoflow as an ecological indicator for reservoir operation to indicate the extent of natural flow alteration. Three reservoir optimization models are established to derive ecological operating rule curves. Model 1 only considers the maximization of average annual hydropower generation and the assurance rate of hydropower generation. Model 2 incorporates ecological objectives and constraints. Model 3 not only considers the hydropower objectives but also simulates the runoff and calculates the ecological indicator values of multiple downstream stations. The three models are optimized by a simulation-optimization framework. The reservoir ecological operating rule curves are derived for the case study of China's Three Gorges Reservoir. The results represent feasible schemes for reservoir operation by considering both hydropower and ecological demands. The average annual power generation and assurance rate of a preferred optimized scheme for Model 3 are increased by 1.06% and 2.50%, respectively. Furthermore, ecological benefits of the three hydrologic stations are also improved. In summary, the ecological indicator ecoflow and optimization models could be helpful for reservoir ecological operations.

scholarly journals An Operation-Based Scheme for a Multiyear and Multipurpose Reservoir to Enhance Macroscale Hydrologic Models

2012 ◽  
Vol 13 (1) ◽  
pp. 270-283 ◽  
Author(s):  
Yiping Wu ◽  
Ji Chen
Keyword(s):  
Land Surface ◽  
Reservoir Operation ◽  
Flood Control ◽  
Assessment Tool ◽  
Southern China ◽  
Hydrologic Model ◽  
Hydrologic Models ◽  
Time Step ◽  
Reservoir Storage ◽  
Multipurpose Reservoir

Abstract This paper develops an operation-based numerical scheme for simulating storage in and outflow from a multiyear and multipurpose reservoir at a daily time step in order to enhance the simulation capacity of macroscale land surface hydrologic models. In the new scheme, besides the purpose of flood control, three other operational purposes—hydropower generation, downstream water supply, and water impoundment—are considered, and accordingly three related decision-based parameters are introduced. The new scheme is then integrated into the Soil and Water Assessment Tool (SWAT), which is a macroscale hydrologic model. The observed water storage and outflow from a multiyear and multipurpose reservoir, the Xinfengjiang Reservoir in southern China, are used to examine the new scheme. Compared with two other reservoir operation schemes—namely, a modified existing reservoir operation scheme in SWAT (i.e., the target release scheme) and a multilinear regression scheme—the new scheme can give a consistently better simulation of the reservoir storage and outflow. Furthermore, through a sensitivity analysis, this study shows that the three decision-based parameters can represent the significance of each operational purpose in different periods and the new scheme can advance the flexibility and capability of the simulation of the reservoir storage and outflow.

Scenario-Based and Scenario-Neutral Assessment of Climate Change Impacts on Operational Performance of a Multipurpose Reservoir

2017 ◽  
Vol 53 (6) ◽  
pp. 1467-1482 ◽  
Author(s):  
Allison G. Danner ◽  
Mohammad Safeeq ◽  
Gordon E. Grant ◽  
Charlotte Wickham ◽  
Desirée Tullos ◽  
...  
Keyword(s):  
Climate Change ◽  
Climate Change Impacts ◽  
Operational Performance ◽  
Multipurpose Reservoir

Flood Control in the Cuiabá River Basin, Brazil, with Multipurpose Reservoir Operation

2013 ◽  
Vol 27 (11) ◽  
pp. 3929-3944 ◽  
Author(s):  
Rafael Pedrollo de Paes ◽  
João Luiz Boccia Brandão
Keyword(s):  
River Basin ◽  
Reservoir Operation ◽  
Flood Control ◽  
Multipurpose Reservoir

scholarly journals A Study on the Relationship between Climate Change and Peak Discharge in Sarawak River Basin

2013 ◽  
Vol 4 (3) ◽  
pp. 23-28 ◽  
Author(s):  
S.Y. Chiew ◽  
O.S. Selaman ◽  
N.R. Afshar
Keyword(s):  
Climate Change ◽  
Statistical Method ◽  
River Basin ◽  
Return Period ◽  
River Discharge ◽  
Peak Discharge ◽  
Low Flow ◽  
Hydrologic Analysis ◽  
Rate Of Decline ◽  
Earth’S Climate

These Earth's climate is getting warmer, and the signs are everywhere. Abnormal river discharge is one of the impacts that can be found in local scale. This endangering condition leads to the necessary attention on river basin in Sarawak, Malaysia and hence gives birth to this study. The objective of this study is to examine the existence of climate change on Sungai Sarawak River Basin through a hydrologic analysis of river discharge of three water level stations: Station Rayu, Station Git and Station Buan Bidi. The methods applied are mass-curve coupled with Gumbel’s graphical statistical method and annual hydrograph. Mass curve plotted shows the deviation of cumulative peak discharge from its original trend with Stations Rayu, Git and Buan Bidi started straying since years 1998, 2001 and 2004 respectively. After breakpoint, Gumbel’s graphical statistical method for chance percent evaluation clearly implies the chance percent for all (exception for Station Buan Bidi) discharges has decreased throughout the years. Whereas Gumbel’s graphical statistical method for return period evaluation suggested an extension of return period after the transition year (exception for Station Rayu). Two graphical methods pointed to the same direction – rate of decline shifting is greater for high flow as compared to low flow. Broadly speaking, precipitation has not much effect on the discharge variation according to annual hydrographs plotted. However, an obvious decrease in monthly average discharge throughout 18 years was found after change at Station Rayu. This support the climate change fact of “dry getting drier”. Water shrinkage in Sarawak River Basin is expected to be experienced frequently in the future.

scholarly journals Revisiting Water Supply Rule Curves with Hedging Theory for Climate Change Adaptation

2019 ◽  
Vol 11 (7) ◽  
pp. 1827 ◽  
Author(s):  
Wenhua Wan ◽  
Jianshi Zhao ◽  
Jiabiao Wang
Keyword(s):  
Water Supply ◽  
Reservoir Operation ◽  
Flood Control ◽  
Climate Adaptation ◽  
Changing Environment ◽  
Specific Expression ◽  
Rule Curves ◽  
Operation Rule ◽  
Practical Tool ◽  
Adaptive Operation

Conventional reservoir operation rule curves are based on the assumption of hydrological stationarity. The aggravating non-stationarity under the changing environment rocked this foundation. The hedging theory is one of the options for adaptive operation based on hydrological forecasts, which can provide a practical tool for optimal reservoir operation under a changing environment. However, the connections between hedging theory and rule curves are not clear. This paper establishes the linkage of rule curves and hedging theory by analyzing three fundamental problems surrounding the design of conventional rule curves, namely the law and design of water supply rule curves, the determination of flood control storage, and the division of refill and drawdown circle. The general interpretation of the conventional water supply rule curves with hedging theory is conducted. Both the theoretical analyses and the Danjiangkou Reservoir case study reveal that, based on the historical records, the rule curves can be interpreted as a specific expression of hedging theory. This intrinsic linkage allows us to propose a more general and scientific method of updating rule curves in the context of non-stationarity. On this basis, the rule-curve-based climate adaptation strategies are figured out using hedging theory. This research is helpful for practical adaptive operation of reservoirs in the changing environment.

Sewer System for Improving Flood Control in Tokyo: A Step towards a Return Period of 70 Years

1994 ◽  
Vol 29 (1-2) ◽  
pp. 303-310 ◽  
Author(s):  
Kazuyuki Higuchi ◽  
Masahiro Maeda ◽  
Yasuyuki Shintani
Keyword(s):  
Return Period ◽  
Flood Control ◽  
Rainfall Intensity ◽  
Runoff Coefficient ◽  
Large Drop ◽  
Construction Costs ◽  
Sewer System ◽  
Construction Period ◽  
Metropolitan Government ◽  
Under Construction

The Tokyo Metropolitan Government has planned future flood control for a rainfall intensity of 100 mm/hr, which corresponds to a return period of 70 years, and a runoff coefficient of 0.8. Considering that the realization of this plan requires a long construction period and high construction costs, the decision was made to proceed by stages. In the first stage, the improvement of the facilities will be based on a rainfall intensity of 75 mm/hr (presently 50 mm/hr), corresponding to a return period of 17 years, and a runoff coefficient of 0.8. In the next stage the facilities will be improved to accommodate a rainfall intensity of 100 mm/hr. In the Nakano and Suginami regions, which suffer frequently from flooding, the plan of improvement based on a rainfall intensity of 75 mm/hr is being implemented before other areas. This facility will be used as a storage sewer for the time being. The Wada-Yayoi Trunk Sewer, as a project of this plan, will have a diameter of 8 m and a 50 m earth cover. This trunk sewer will be constructed considering several constraints. To resolve these problems, hydraulic experiments as well as an inventory study have been carried out. A large drop shaft for the trunk sewer is under construction.

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