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一、年迳流概况汉江流域属副热带季风区,而地势又系西北高并向东南敞开,温暖而多雨,故河流的补给,颇为丰盛。根据1930年至1954年25年资料统计的结果,在碾盘山站多年平均迳流量,达493亿公方,较黄河为多(均未计灌溉已用水量,如将此水量计入,黄河多年平均迳流量多於汉江约10％左右)。在干流各站的流量过程线上,可以看出每年的11月至次年的2月为退水期,流量平稳下落,几无起伏波动。此期的迳流量,平均为全年的11.6％,
First, the annual flow profile Hanjiang River Basin is a subtropical monsoon region, and the topography of the Department of the Northwest and open to the southeast, warm and rainy, so the river recharge, rather rich. According to the statistics from 25 years from 1930 to 1954, the average flow rate at the Nianpanshan Station stood at 49.3 billion square meters, much more than that of the Yellow River (all of which had not been used for irrigation, Average 迳 flow more than about 10% Han River). Flow in the mainstream of the station process line, we can see that every year from November to February next year is the return period, the steady decline in traffic, with few ups and downs fluctuations. This period of 迳 traffic, an average of 11.6% for the year,