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(一)施工条件本电站位于錢塘江主要支流新安江上的銅官峽谷区,交通尚称便利。坝址区域气候溫和(年平均溫度17.3℃,絕对最高45℃,絕对最低-9.5℃),雨量充沛(年平均雨量1859公厘)。新安江山溪性河流的特性显著,流量变化及水位漲落差别很大。实測最大流量达13600秒公方,根据多年資料推算5%頻率达16000秒公方,1%达20400秒公方,最小流量力10.7秒公方。5—7月为洪水期,8月至次年4月为枯水期,各月逕流分布極不平均,枯水期仍有較大洪峯出現,这给施工导流帶来不利的因素。
(A) Construction Conditions The power station is located in the Tongguan Gorge area on the Xin’an River, a major tributary of the Qiantang River. Traffic is still convenient. The climate in the dam site is mild (annual average temperature 17.3 ℃, absolute maximum 45 ℃, absolute minimum -9.5 ℃) and abundant rainfall (average annual rainfall 1859 mm). Xin’an Jiangshan Creek features significant river flow and water level fluctuations vary widely. The measured maximum flow of 13600 seconds public square, based on years of data projections 5% frequency of 16000 seconds public square, 1% up to 20400 seconds public square, the minimum flow force of 10.7 seconds public square. May-July is flood period, August to April next year is dry season. Monthly runoff distribution is extremely uneven. There are still large flood peaks during the dry season, which brings unfavorable factors to the construction diversion.