Abstract
Abstract. The runoff of the Fenhe River flowed into the Yellow River (RRY) is reducing significantly due to the influence of climate change and human activities. It is generating bad situation of shortage of water resources and led to the deterioration of ecological environment of Shanxi Province. At the same time, the reduction in RRY causes the runoff reduction in Yellow River and exacerbated the water resources shortage of the middle area of the Yellow River. Therefore, it is important to alleviate water shortage and develop the soil and water conservation measurements and regional water policy by analyzing the influence of human activities and climate change on the RRY. The existing study quantified the reduction in amount of RRY which caused by human activities and climate change using statistical methods and watershed hydrological model. The main results of the study were as follow: Using hydrological variation diagnosis system, the variation characteristics of long time series of measured annual runoff were analyzed in Hejin station that is the Fenhe River control station. The results showed that the runoff of Fenhe River run into Yellow River declined year by year, in 1971, fell the most obviously. The impact of LUCC on runoff was calculated using the method of area ratio in the Fenhe River basin. Human activities were major factor in the reduction of RRY than the climate change, contributed 83.09 % of the total reduction in RRY, Groundwater exploitation gave the greatest contribution to the decrease in RRY in the scope of several kinds of human activity (30.09 %), followed by coal mining (26.03 %), climate changed contributed 19.17 % of the total reduction of RRY, and the decrease of precipitation contributed 20.81 %. But the variation of air temperature and wind speed would result in the increase of the amount of RRY.
Highlights
The Yellow River Basin is the origin of Chinese civilization, is the second largest river after the Yangtze River, but the Yellow River Basin water shortage is extremely short, accounting for about 2 % of China’s runoff is about 12 % of China’s population production and living water, The basin’s gross domestic product (GDP) accounts for 9 % of the country (He et al, 2013)
The measured annual runoff of Hejin station is divided into two periods: “basis period” and “change period”, the difference between the mean measured annual runoff of “base period” and “change period” is the total reduction, The total reduction in the Fen River into the Yellow River runoff includes the reductions caused by climate change and the reductions caused by major human activities
In this paper, based on the determination of the main influencing factors of the runoff of the Fenhe River flows into the Yellow River, the variation of the runoff series trend of the Hejin River in the Hejin River is analyzed by the hydrological variation diagnosis system
Summary
The Yellow River Basin is the origin of Chinese civilization, is the second largest river after the Yangtze River, but the Yellow River Basin water shortage is extremely short, accounting for about 2 % of China’s runoff is about 12 % of China’s population production and living water, The basin’s gross domestic product (GDP) accounts for 9 % of the country (He et al, 2013). Fenhe River is the second largest tributary of the Weihe River in the middle reaches of the Yellow River. It has an important influence on the process of water and sediment evolution in the middle and lower reaches of the Yellow River. Its basin area is 39 826 km, the basin area of 1738.7 million km of arable land, accounting for 30 % of the total cul-
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