The Decrease of the Flow and Its Cause at Datong
Hydrological Station of the Yangtze River
Abstract: The increase in temperature not only causes changes in many other climate elements but also al-ters the timing and magnitude of runoff. Such changes raise the possibility of environmental and socioeconomic dislocations, and they have important implications for future water resources planning and management. Datong hydrological station, located at downstream of the Yangtze River, is an important station controlling the Yangtze River basin and is the uppermost boundary of ocean tide rising of East China Sea. Its hydrological elements change obviously because of climate warming. In the present paper, simple and multiple regression analysis and M-K method were used to research the variations and trends of flow and meteorological elements of Datong hydrological station. The results showed that there were obvious intra- and inter-annual variations for the annual mean flow during the year of 1951-2011 in Datong station. The annual mean and high water period flow decreased significantly and low water period flow increased slightly. When air temperature rose significantly after 1994, precipitation, wind speed, relative humidity and sunshine duration decreased, and annual mean flow, low and high water period flow also decreased. There was closed relationship between flow and meteorological elements, in which the contributions of precipitation, temperature, relative humidity and sunshine duration to decrease of annual mean flow were about 61.9%, 18.6%, 13.5%, and 6.0%, respectively. There were different contributions of meteorological elements to decrease of high and low water periods flow.
文章引用: 荣艳淑 , 刘晓延 (2014) 长江大通水文站流量减少及其原因分析。 水资源研究， 3， 326-336. doi: 10.12677/JWRR.2014.34040
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