屏東大潮州地下水人工湖之補注池水文地質特性調查之研究

本研究目的為進行大潮州人工湖第1期工程補注湖區(原作為沉澱池功能)進行水文地質參數調查與試驗，由於目前尚未進行實際補注引水作業，藉由實際採樣分析掌握土壤物理特性與入滲速率，以提供為來補注期間因細顆粒的阻塞而影響入滲效率之參酌。根據滲透試驗結果，A點採樣位置為靠近補注池西側，整體平均水力傳導係數為1.85公尺/天， B點採樣位置為靠近補注池西側，整體平均水力傳導係數為8.76公尺/天。C點採樣位置為靠近補注池西側，整體平均水力傳導係數為1.37公尺/天，大概屬於細砂土壤範圍。依據土壤粒徑分類，於採樣點A、B、C皆為粗顆粒土壤，主要通過4號篩準可區分出礫石與砂，通過50%以上屬於砂，反之則為礫石。30組分析樣品中，3組是屬於礫石，27組都是屬於細砂土壤。依據孔隙率調查及試驗分析結果顯示A點平均孔隙率為0.12、B點平均孔隙率為0.11及C點平均孔隙率為0.12。本研究成果建議應配合大潮州人工湖二階湖區引水補注之入滲速率的參考依據，掌握每年豐水期引水的實際補注量與入滲率。由於林邊溪濁度與含砂量高，細顆粒阻塞的效應需要持續觀測評估。建議後續可於二階湖區補注湖內，進行現場透水試驗。由於人工湖引水補注產生的水頭高、土壤孔隙率、粒徑大小、水溫影響液體之黏滯性，都可能影響水力傳導係數的變化。

關鍵字

水文地質參數；地下水補注；入滲速率；土壤孔隙率

並列摘要

The purpose of this study is to carry out the investigation and experiment of hydrogeological parameters in the supplementary lake area of the first phase of the artificial lake in the Dachao State. Since the actual refilling operation has not been carried out, the physical characteristics and infiltration rate of the soil are grasped by actual sampling analysis to provide The consideration of the infiltration efficiency due to the blockage of fine particles during the refill period. According to the results of the permeation test, the sampling point of point A is near the west side of the replenishment tank, the overall average hydraulic conductivity is 1.85 m / day, and the sampling position of point B is near the west side of the replenishment tank, and the overall average hydraulic conductivity is 8.76 m / day. The sampling point of point C is close to the west side of the replenishment tank, and the overall average hydraulic conductivity is 1.37 m / day, which is probably in the fine sand soil range. According to the classification of soil particle size, the sampling points A, B and C are coarse-grained soils. The gravel and sand can be distinguished mainly by the No. 4 sieve, and more than 50% belong to sand, and vice versa. Among the 30 groups of analysis samples, 3 groups belonged to gravel, and 27 groups belonged to fine sand soil. The results of this study suggest that the actual infusion rate and infiltration rate of water diversion during the wet season should be mastered in accordance with the reference basis of the infiltration rate of the water diversion and replenishment in the second-order lake area of the artificial lake of Dachaozhou. Due to the high turbidity and sand content of Linbian River, the effect of fine particle blockage requires continuous observation and evaluation. It is suggested that the site can be refilled in the second-order lake area for on-site permeable test. Due to the high head height, soil porosity, particle size and water temperature affecting the viscosity of the liquid caused by artificial lake water replenishment, the hydraulic conductivity coefficient may be affected.