本文關(guān)鍵詞：黃河近年徑流泥沙劇減的多因素貢獻(xiàn)率分析（英文）

  更多相關(guān)文章： human activities soil and water conservation climate change discharge and sediment yield Yellow River China

【摘要】：The Yellow River basin is well known for its high sediment yield. However, this sediment yield has clearly decreased since the 1980 s, especially after the year 2000. The annual average sediment yield was 1.2 billion tons before 2000, but has significantly decreased to 0.3 billion tons over the last 10 years. Changes in discharge and sediment yield for the Yellow River have attracted the attention of both the Central Government and local communities. This study aimed to identify the individual contributions of changes in precipitation and human activities(e.g. water conservancy projects, terracing, silt dams, socio-economic and needs, and soil and water conservation measures) to the decrease in discharge and sediment yield of the Yellow River. The study used both improved the hydrological method and the soil and water conservation method. The study focused on discharge analysis for the upper reaches and the investigation of sediments for the middle reaches of the river. The results showed that discharge and sediment yield have both presented significant decreasing trends over the past 50 years. Precipitation showed an insignificant decreasing trend over the same period. The annual average discharge decreased by 5.68 billion m3 above Lanzhou reach of the Yellow River from 2000 to 2012; human activities(e.g. socio-economic water use) contributed 43.4% of the total reduction, whereas natural factors(e.g. evaporation from lakes, wetlands and reservoirs) accounted for 56.6%. The decrease in annual discharge and sediment yield of the section between Hekouzhen station and Tongguan station were 12.4 billion m3 and 1.24 billion tons, respectively. Human activities contributed 76.5% and 72.2% of the total reduction in discharge and sediment yield, respectively, and were therefore the dominant factors in the changes in discharge and sediment yield of the Yellow River.
【作者單位】： Yellow
【基金】：National Basic Research Program of China,No.2011CB403303 National Key Technology R&D Program,No.2013BAC05B04 National Natural Science Foundation of China,No.41571276
【分類(lèi)號(hào)】：P333
【正文快照】： 1 IntroductionThe Yellow River is known to carry a large amount of silt.The basin has an annual sedimentyield of 1.6 billion tons with a sand content of 37.4 kg/m3,which is 25%higher than that ofthe Grand Canyon of the Colorado River in the USA(WCHEE,198

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