| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 96 === In Taiwan, the distribution of rainfall is uneven. Recently, the probability of the extreme weather is higher than before. The phenomena of water shortage are happening with increasing frequency. But it is hard to build a new reservoir. We had better enlarge the original facilities of water supply system to improve this situation if the environment is allowed.
There is a special water supply system which is consists of many ponds in Taoyuan. This special water supply system not only provides irrigation but can storage the water. In the past studies, most people focus on each pond or each series of ponds dredging a certain level to find which causes the water quantity operation the most. To dredge the pond needs a lot of energy and waste time. Right now, decision-maker can save time and energy through this model. Best of all, decision-maker can already find which is emergent pond in the system and how much the ponds need to be dug before digging every pond. This model will be good at decreasing the decision-maker’s besetment.
This study is useful when someone aims at benefit. They can judge how to let fallow area more useful that not only no agriculture water shortage but also can transfer land into different way to help life better. The advantage of research is this model can judge immediately which pond should be expanded and how much capacity needs.
This study adopts linear programming. The linear programming is needed to set the objective function and constrains. The objective function consists of the cost of expansion pond and the benefit coming from operation water quantity. The constraints include the continuity function 、the limit of storage capacity and water balance equation, etc. The factor of fallow rate is included in these functions. Then we can get the trade-off optimal fallow area and capacity expansion of pond in pond supply system.
The study area is Shihmen water treatment plant and its nearby area. According to the result of model, the present situation doesn’t need to expand the pond. Increasing fallow rate will get optimal operation. However, if water shortage is getting serious, the system needs to expand the pond to solve the problem. The model shows that the most emergent pond should be She-Zi No.1 pond.
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