| Summary: | 碩士 === 國立成功大學 === 工學院工程管理碩士在職專班 === 101 === This paper mainly by the location experiment which be applied by “ Cheng-Kung Porous Basket(CKPB)” . We discusses this porous basket group regarding the river protection effect by this conduction current method. The location experiment synthesizes four kinds by the multi-porous basket system .(1)The first kind of the result is applied by the single porous basket establishment.(2) The second is set up by two-row porous basket and parallel .(3)The third one is two row of porous basket ,then establishes by the second row of position which be set into the first row of middle position, then extend the first row of conduction current effect. (4) The fourth kind is enhance the effect by the above method (1~3).We can gain the siltation effect and the stability because of the location experimental observation porous basket group.
According to the experiment result, when the water level elevation surpasses above porous basket 1.2m, the porous basket is not obvious to the speed of flow influence. After the porous basket group totally be covered by the silt , it is no longer to display the conduction current effect. The porous basket group be observed under rainy , the multi porous basket group which structure have still not be broken by flood attack , therefore we know those establishment method of porous basket group and the multi- porous cylinder which can withstand the flood attack.
We can gain the various result by the experiment area to flush silt , according to the porous basket group anti- water obstruct effect, the deep trench have the river deposit effect, the river deposit elevation by the most upstream 1.5m ,then gradually reduces toward the downstream to be 0.2m. It is demonstrating the gradient of the riverbed is getting smoothly and also slow down the speed of flow. According to the speed of deep porous basket flow observation that we can know the porous basket flood is approach close to the riverbed. The flood of mainstream is tendency to the center of river. This result not only can reduce the scour influence, but also can protect the dike security.
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