圖書典藏及影音數位平台

對於攔河堰之壩體、靜水池及下游河道進行三維數值模擬分析，企能進一步了解水工結構物之複雜流場及作用力，有助於後續改善工程之規劃與設計。

Because of the 921 earthquake, the rise of the strata at the Mingzhu Bridge caused the scour to the source and the loss of the armored-layer As a result, the energy dissipation function of the Jiji River Weir's static pond is not complete. The maximum erosion depth of the downstream channel has reached about 15 meters, endangering the River Weir and flood control structures. This project is a three-dimensional numerical simulation analysis to understand the effectiveness of the improvement method and whether there are subsequent plans to make the river more stable in this section. The three-dimensional numerical simulation is mainly aimed at comparing the impact of the operation mode of the gate on the downstream river channel with the current situation and the improvement results of the hydraulic analysis results The way of gate operation is divided into two parts, the spillway is compared with 650cms and 1,300cms of different flows, and the sand drains are used as a comparison by opening the left bank or the right bank with 350cms. The current situation and improvement programme's analysis results are divided into four scenarios, namely, the status quo, the original improvement programme, the proposed option 1 and the recommendation sprogramme2.The result of gate operation can be found that the spillway opening the left gate relatively opens the right gate relatively has a greater impact on the downstream, while the sand drain has less significant impact due to the smaller flow. The current results can be seen that the water flow has slowed down after the deenergy, but after the change of terrain will be accelerated situation, the original improvement program can be informed that the flow rate has been reduced, but the downstream left bank high beach flow rate is still high; However, it is still necessary to pay attention to the subsequent development of the flow rate of the lower left bank high beach.