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汉江流域,位于秦岭南坡,系自西北向东南的狭长地带,流域面积159,000平方公里。安康以上的受水面积约为襄阳以上的40％,均属副热带季风区,暴雨洪水的产生和发展是与季风的活动分不开的。为便于研究汉江的洪水情况,今以安康襄阳两站为代表;在气候特性上安康以下北岸的支流洵河,基本上与安康以上相似,可能由于夏季风顺秦岭南坡东下的结果。南岸的堵河仍有相当程度的相似。其他地区,距安康愈远,气候特性愈不相同,如下游及唐白河区,则类似长江中下游地区;而安康以上,多相似于长江上游地区。兹根据实测及调查洪水资料结合气候文献研究的规律,分析论述如下。
Hanjiang River Basin, located in the southern slope of Qinling, is from the northwest to southeast of the narrow strip, the basin area of 159,000 square kilometers. The receiving area above the healthy level is about 40% of that above Xiangyang, which belongs to the subtropical monsoon zone. The occurrence and development of storm floods are inseparable from the monsoon activities. To facilitate the study of the flood in the Han River, now represented by Ankang Xiangyang two stations; tributary of the Ankang below the Ankang climatic characteristics are basically similar to the above Ankang, probably due to the summer monsoon east of the south slope of the Qinling Mountains results. The blocking of the South Bank is still quite a bit similar. In other areas, the farther away from Ankang, the more different the climatic characteristics. For example, the lower reaches and Tangbaihe area are similar to those in the middle and lower reaches of the Yangtze River; and those above Ankang are similar to the upper reaches of the Yangtze River. Based on the measured and investigated flood data combined with the laws of climate literature, the analysis is as follows.