| Summary: | 碩士 === 國立成功大學 === 水利及海洋工程學系碩博士班 === 98 === The reservoir rule curve regulates released water to improve water use efficiency under different drought conditions. Rule curves currently are mainly established by simulation method, but it needs experienced engineers to adjust empirically.
Based on the property of stabilizing water supply of rule curve, this thesis analyzed the average shortage rate for each specific volume of a reservoir. It then connected storages of the same shortage rate of all ten-day periods as an effective way to establish reservoir rule curves. Because there are tremendous number of combinations of rule curves, one can select the best set of rule curves by comparing the performance of different management objectives.
This research uses the Water Resources Allocation Simulation Model (WRASIM) and imposes rule curve screening restriction to improve the correctness and efficiency of developing rule curves. This approach can reduce trial and error process and find a preferable set of curves more quickly. It provides engineers who adjust rule curves in trial and error method a direction to improve the curve to achieve related management objective.
This research took the Tsengwen-Wushantou (T-W) system as case study to screen different types of rule curves according to different management objectives. The final near-optimal rule curves for different management objectives are described as follows:
1.If T-W system wants to get maximum of water supply, must raise up the storage position of middle limit which from the middle to the end stage of wet season to execute first level discounted water supply. It rations agricultural and industrial water supply, and makes each demand to get more water in dry season. The lower limit of rule curve almost downs to horizontal line. It reveals may be only one middle limit is necessary to execute first level discounted water supply to get the maximum water usage.
2.If T-W system wants to raise the reliability of water supply, must raise up the storage position of lower limit started from the middle stage of wet season, and it executes second level discounted water supply. It takes conservative policy of water supply, but will improve stable water supply in the future and reduce shortage index.
3.If T-W system wants to avoid the situation of empty reservoir, must raise up the storage position of lower limit of rule curve substantially from the middle stage of wet season till the end stage of dry season, and it will execute second level discounted water supply earlier than the above two objectives. The rule curve satisfies total water supply not less than rule curve of M3T10, and to tide over the special drought in the future. It not only maintains the water supply but also reduces the empty storage days.
|
|---|
