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題 名 | 考慮容量擴張之非拘限含水層水量管理規劃=Optimization of Groundwater Supply under Consideration of Capacity Expansion in Unconfined Aquifer |
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作 者 | 張良正; 葉明生; 陳宇文; 蕭金財; | 書刊名 | 中國土木水利工程學刊 |
卷 期 | 19:1 2007.03[民96.03] |
頁 次 | 頁35-43 |
分類號 | 443.67 |
關鍵詞 | 動態控制理論; 遺傳演算法; 非拘限含水層; Dynamic optimal control; Genetic algorithm; Unconfined aquifer; |
語 文 | 中文(Chinese) |
中文摘要 | 水資源開發最經濟而合理的方式應該是隨著需求增加而逐步增大其規模。對於地下水利用管理而言,就容量逐漸擴增的營運方式之優選問題而言,包含了離散型變數、非線性及動態等特性,以往並未有演算法或優選模式,可完整的解此問題。本研究乃應用遺傳演算法與動態控制理論針對二維非拘限含水層(unconfined aquifer)系統,發展考慮容量擴張之地下水最佳水量管理規劃模式。研究結果顯示,考慮容量擴張的影響而分時期的增設抽水井,可大幅降低設井固定成本及總成本。由於本模式考量的容量擴增為更合理的規劃型態,並能在可接受的計算資源下求得其最佳解,因此可為提昇地下水資源管理效率的有力工具。 |
英文摘要 | Groundwater resource plays a vital role in regional water resources in diverse ways. Using groundwater in a region water supply generally depends on a large amount of pumping wells, i.e., a wells network. Conventional designs determine the capacity of a network system once for all and the network system is designed to fulfill the maximum water demand. Since the water demand is used to increase in time, the system may be over design initially. Therefore, this work proposes a novel optimal capacity-expansion model capable of determining an optimal schedule to expand the system capacity according to increasing water demand. While combining the Genetic Algorithm (GA) and Constrained Differential Dynamic Programming (CDDP) to solve the optimization problem, the proposed model assumes a 2-D groundwater flow for a confined and unconfined aquifer. The main structure of the hybrid algorithm is GA, in which each chromosome represents a possible network design and its expansion schedule. The fixed cost of each chromosome can be computed easily. The DDP then solves the optimal pumping and injecting scheme and, finally, evaluates the optimal operating costs associated with each chromosome. Simulation results indicate that, under the same annul interest rate and demand, the capacity-expansion model can save more present value of the total cost than the conventional design can that determines the system capacity initially. Furthermore, the benefits of using the capacity-expansion model increase with a rising interest rate. Our results further demonstrate that the proposed model is highly promising for use in facilitating a cost-efficient design of well system for regional groundwater supply. |
本系統中英文摘要資訊取自各篇刊載內容。