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论述了同位素及天然示踪方法探测大坝渗流场的基本原理与试验方法．通过夏季与冬季两次不同水位条件下对龙羊峡大坝进行的同位素综合示踪探测，已初步查清了南北大山水沟蓄水池的渗流及工业用水补给是造成左岸地下水位偏高的主要原因；综合示踪试验发现顺河断层Ｆ５７ 存在较为严重的河水渗漏，该渗漏造成左岸地下水位的壅高，阻碍了左岸边坡水的排泄；Ｇ４ 劈理带的渗漏不是引起左岸地下水位偏高的主要原因；跨河断层Ｆ１８ ，Ｆ７１ ，Ｆ７３ 等与顺河断层Ｆ５７ 交汇，将Ｆ５７ 断层的渗漏河水补给这些跨河断层，造成Ｆ１８ ，Ｆ７１ ，Ｆ７３ 等断层中的水位升高，并将渗漏河水补给右岸，造成３４＃ ，１８ ＃ 等孔位附近的地下水位升高．
The basic principle and test method of isotope and natural tracing method for seepage of dam are discussed. Through the integrated isotope tracing of Longyangxia Dam under summer and winter conditions of two different water levels, it has been preliminarily ascertained that the seepage of industrial ditches and industrial water supply in the dams in the northern and southern mountains have resulted in the high groundwater levels in the left bank The main reason is that the comprehensive tracing test shows that the F57 of Shunhe fault has serious water seepage which causes the high groundwater level in the left bank and hinder the water excretion of the left bank slope. The leakage of the G4 cleft zone is not caused by the left bank The main reason for high groundwater level is that the cross-river faults F18, F71 and F73 intersect with the F57 of Shunhe fault and supply the leaking river water from the F57 fault to these river faults, resulting in an increase in the water level in faults such as F18, F71 and F73 , And will leaking river water supply to the right bank, resulting in 34 #, 18 # hole near the water table elevation.