| Summary: | 碩士 === 國立成功大學 === 資源工程學系碩博士班 === 96 === In the Huwei irrigation area, irrigation water obtained through the surface water for the agricultural fields. The groundwater is used to supplement the agricultural-use surface water. However, the extensive exploitation of ground water resources near the coast area in Yunlin County has brought with the land subsidence an undersired environmental side effect. Moreover, the High Speed Railway passes through this area. Land subsidence seriously affects the safety of the High-Speed Railway structures. The primary purposes of this study are to construct an optimised water management for surface water and groundwater, especially in along the High-Speed Railway line.
In this study, two stages are performed. In the first stage, a regional hydro-geological model in the Chou-Shui alluvial fan was constructed. Groundwater level for Chou-Shui alluvial fan was modelled using the computer model PROCESSING MODFLOW. By calibrating with groundwater level, the aquifer hydraulic parameters of the system were estimated. In the second stage, the Huwei irrigation area was adopted to investigate the conjunctive use of surface water and groundwater. The code technique, MODMAN was introduced to obtain the best unit plus value and response matrix of allowable pumping water for groundwater resources management. The LINDO code is introduced to optimalize the groundwater management scenarios under several cases including the well distribution, the changes of discharging plan, and the ground channel allocation. Furthermore, the management scenarios of the restricted pumping water in the nearby area of High Speed Railway were performed.
Three scenarios (A1, A2 and A3) of water allocation management were performed for the optimisation calculations of this study based on the design of the objective functions and constraints. The maximum allowable water pumping quantities of scenarios B1, B2, and B3 were considered and in comparison between Scenario C1 and C2 due to the High Speed Railway passes through this area. The results indicated the scenario C1, the nearby area of High Speed Railroad doesn’t allowed pumping water, that the safety levels are set the constraints of water level. In 2005, from 16 through 36 of a period of ten days, Scenario C1 allows to an increasing 41,580 m3 of groundwater water pumping and has an increasing 10,371 m3 of remaining water. Finally, this optimal solution is evaluated to lead the groundwater raised 1.0 m.
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