人工濕地之地下水文調查研究－以屏東縣東港溪舊河道為例

The Investigation Study of Groundwater Hydrology on the Constructed Wetland- Case for Tungkang Ancient River in Pingtung Plain

劉宋懷(Sung-Huai Liu)

指導教授 ： 丁澈士

國立屏東科技大學/工學院/土木工程系所/碩士(2015年)

https://doi.org/10.6346/NPUST.2015.00278

摘要

屏東縣東港溪崁頂舊河道因東港溪新河堤施作完成後，使舊河道濕地水體來源─原東港溪主流水源遭斷絕，僅靠降雨及地下水補注，濕地水體置換率甚低，其水體來源本由東港溪新河道閘門所控制，使新河道水體流入舊河道內，形成一開放式濕地，但舊河道內上游閘門關閉將水源阻絕，轉變成封閉式濕地，造成舊河道內水質優養化使舊河道內生產力減低，有機質的累積及對流減少許多。因此，本研究選定港東二號橋以下2公里長之舊河道作為研究區域，調查此河道內濕地之水源與地下水變化，進而探討儲水變化量。研究結果發現，當有降雨行為時，舊河道內水位並不會劇烈變化，而是因集水區降雨補注地下水進而補注舊河道內，僅造成整體水位上升或下降，經水收支平衡公式得知舊河道濕地在單位時間內濕地儲水量之體積變化以11月至6月分別為： 279,402 m3、326,475 m3、362,394 m3、332,451 m3、298,875 m3、328,810 m3、607,776 m3、399,126 m3。

關鍵字

東港溪崁頂舊河道 ； 水收支平衡 ； 地下水補注

並列摘要

The embankment of Tungkang current new river water way was completed in Pingtung Plain, import water source from the wetland in Tungkang ancient river i.e. the Tungkang mainstream water source was cutoff, rely on rainwater and groundwater recharge. The wetland water recharge velocity is very low Surface water source was controlled by the front gate in the Tungkang current river. The river water flows into the ancient river and thus forming an open wetland. Due to the ancient river has become an enclosed wetland by the water denial of the upstream gate, inducing surface water quality entrophication and productivity reduce in the ancient river. The accumulation of organic matter and then reduce the convection.
The research is to take the investigated site from the downstream 2 km of the Gang-Dong second bridge at the ancient river as the study area. To find the wetland water source and groundwater change and then investigate the storage amount of change in this river.
From the investigation results of the study, the water level fluctuation is not dramatic changed while rainfall in the ancient river. Instead of catchment rainfall and form recharge groundwater and then inflow to the ancient river, cause by the overall water level rise or fall. The water storage changes in the ancient river by water budget calculations are 279402, 326475, 362394, 332451, 298875, 328810, 607776, 399126 m3 separately occurred in the period of November to June.

並列關鍵字

Tungkang Ancient River ； water budget calculations ； groundwater recharge

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