水库一般是中等尺度流域的集水区，且水库底层深入基岩层，利用其无潜流等优势可准确地测得流域河川径流量。文章通过大野口流域气温、降水和流域河川径流18 a （1994-2011）的长期监测与研究，结果表明：（1）大野口流域年均气温、降水量和河川径流分别为1．62℃、374．06 m m和166．7 m m。（2）气温、降水和河川径流均呈波动性上升趋势，气温上升速率约0．023℃灋a-1，降水和河川径流上升速率约1．8mm 灋a-1；降水和河川径流高峰期或低谷期相隔约8a。（3）气温、降水和河川径流在1月最小，平均值分别为-11．91℃、2．74mm和0．32mm ；7月最大，平均值分别为14．38℃、82．48 m m、37．48 m m。%Reservoir generally is medium scale catchments basin ,which bottom goes deep into bedrock layer .There-fore ,it is exactly to measure watershed runoff by taking advantage of its no undercurrent .This study represented a long - termmonitor and research on Dayekou watershed run off temperature ,rainfall and river runoff for 18a (1994-2011) .Results showed that :(1 ) the annual average of temperature ,rainfall and runoff were 1 .62℃ , 374.06mm and 166 .7mm ,respectively ;(2) the temperature ,rainfall and runoff showed a wave rising trend and the rising rate of temperature ,rainfall and runoff were about 0 .023 ℃ · a-1 and 1 .8 mm · a-1 .Intervals of peaks and troughs for rainfall and runoff were 8 a;(3) these three indexes showed the lowest levels in January ,with averages were -11 .91 ℃ ,2 .74 mm and 0 .321 mm ,respectively ;the largest averages appeared in July ,with 14 .38 ℃ ,82.48 mm and 37 .48 mm .
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