用稳定同位素(δD、δ18O)研究册田水库清泉洞补给水源

清泉洞穿过坝体,是大坝工程的隐患,搞清楚清泉洞流量的主要补给来源,是水库漏水还是左岸地下水的渗水可为加固工程提供重要依据。所以,从清泉洞、水库和左坝肩附近地区各取水样,用同位素δD和占δ¹⁸O进行对比分析。从分析结果看出,清泉洞水的流量主要是由水库水补给的,但也有一小部分从左岸渗入的地下水。

WATER FLOW ANALYSIS FOR THE QINGQUAN CULVFRT OF THE CETIAN RESERVOIR BY MEANS OF STABLE ISOTOPES(δD AND818O)

The Cetian Reservoir is located on the middle reach of the Sanggan River near the Datong City, Shanxi Province.In order to secure a smooth progress of construction work of the dam, a drainage culvert was installed there when the works started to divert the spring water. This culvert was later buried and incorporated into the dam body and always referred to as the Qingquan Culvert. After the completion of the reservoir project, the water flow in the Qingquan Culvert increased. According to the result of observation, the flow in the Culvert changes with the fluctuation of the reservoir water levels.Lying under the dam body, the Qingquan Culvert possess a hidden danger to the safety of the dam. The purpose of this study is to determine whether the increase of the flow in the Qingquan Culvert is due to the increase of the spring water discharge or due to the seepage water through culvert walls, that is, the seepage water through side walls or base of the culvert into the culvert water passage. So water samples were taken from the Qingquan Culvert, the reservoir as well as the underground water for the analysis of stable isotopes δD and δ¹⁸O. The results of analysis show that the wafer sampled from the Culvert and that from the reservoir prove to be similar. Therefore a preliminary conclusion can be made as follows: The volume variation of the water flow of the Qingquan Culvert is generally a function of the reservoir water level.