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通过对大凌河中上游4个水文站1980~2008年实测水沙资料分析,表明大凌河中上游属“水少沙多”河流,且泥沙主要来源支流第二/牛河以及老虎山河。但近10 a大凌河中上游径流、泥沙总体呈现减少态势,且集中在汛期。并对该区域降水、水利工程以及水土保持措施等人为活动影响因素进行了分析,通过双累计曲线表明主要产沙支流水土保持综合治理总体效果明显,但受局部地区矿业开采剧增,第二/牛河从2000年输沙量有所增加。
Through the analysis of the measured data of water and sediment from 1980 to 2008 at the four hydrological stations in the middle and upper reaches of the Daling River, it shows that the middle and upper reaches of the Daling River belong to the “less water and more sand” rivers and the main tributaries of the sediment are the second / Niuhe and the Laohushanhe . However, the runoff and sediment in the middle and upper reaches of the Daling River in the past 10 years showed a decreasing trend and were mainly concentrated in the flood season. And analyzed the influencing factors of human activities such as precipitation, water conservancy projects and water and soil conservation measures in the region. The double cumulative curves show that the overall effect of comprehensive management of water and soil conservation in the major sediment tributaries is obvious. However, due to the sharp increase in mining in some areas, Cattle River from 2000 sediment transport increased.