《Table 1 Available surface water and surface water yield in different reaches of the Yellow River》

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《流域水资源利用的极化程度研究——以黄河流域为例（英文）》

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（unit:108 m3）

This paper assessed the degree of polarization of the water resources of the seven reaches of the Yellow River using the WRUP model.Surface water availability was first estimated using formula（4）.The amount of surface water usually refers to natural river runoff.River water demand is theoretically determined by selecting the maximum value of the base water flow，ecological water demand and sediment discharge water demand.In addition，river water demand is usually replaced by 30%–40%of the runoff in the actual calculation（Yao et al.，2005；Zhang，2008；Guo，2001）.We selected 30%as the river water demand in this study.Discarded water is the amount of water that cannot be controlled or used during the flood period；it is the flood season runoff minus the controllable water use.The results are shown in Table 1.