2000年以來黃河流域干支流水沙變化趨勢及其成因分析
[Abstract]:In view of the great changes in the characteristics of water and sediment in the Yellow River basin since 2000, the water and sediment data of the main hydrological stations of the main tributaries of the Yellow River from 2000 to 2014 were analyzed by M-K test method, and the changing trend and causes of the water and sediment in the main tributaries were explored. The more reliable mutation point was determined by Yamamoto mutation test. The results show that, compared with 1950 ~ 2000, the decreasing ratio of runoff of each hydrologic station in the main stream increases along the course, and the decreasing amplitude of the supporting sediment is larger than that of the main stream, and the tributaries between the headway and Tongguan are the main factors affecting the change of the sediment discharge in the reach. From Longmen to Tongguan station, the Weihe River has a great influence on the runoff of the main stream, and after the diagnosis of Yamamoto mutation test, 20 false points are excluded, and it is found that the runoff and sediment discharge of the main stream of the Yellow River have five or six strong abrupt changes in the period of 2000 ~ 2014, respectively. However, the distribution of sudden change points of tributaries was scattered and had no obvious relationship with the main stream, and the runoff of the main stream had an increasing trend since 2004, The M-K value broke through the upper limit of the critical value 1.96 after 2010, and the annual sediment discharge in the middle reaches increased before 2003, decreased after 2005 and exceeded the lower limit of critical value after 2008.
【作者單位】: 武漢大學(xué)水資源與水電工程科學(xué)國家重點實驗室;
【基金】:國家重點基礎(chǔ)研究發(fā)展計劃(973計劃)(2010CB429002)
【分類號】:P333
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