游荡型河道挟沙力沿河宽的分布

Research on sediment carrying capacity transverse distribution in braided river

挟沙力沿河宽分布的变化是造成游荡型河道主流频繁摆动的主要原因之一，掌握其变化规律是研究游荡型河流演变规律的关键．通过对游荡型河道成因及河道演变特性进行分析，结合黄河下游花园口-高村1954～1958年的水沙资料，考虑暴涨暴落的洪水和剧烈变化的地形条件对挟沙力分布的影响，建立了适用于黄河下游游荡型河道的二维挟沙力公式．通过实测资料检验，计算值与实测值符合良好，表明该公式可以较好地反映游荡型河道挟沙力沿河宽分布的特性．

The law of sediment carrying capacity transverse distribution in braided river, which is the one of the key factors to research on the evolution rule of braided river, is presented. Based on analyzing the characteristic of braided river, sediment carrying capacity transverse distribution is closely related to the great change discharge flood and the landform change. According to the observed data from braided reach of the Yellow River, after the relation and the law between above-mentioned two factors and sediment carrying capacity in the river has been confirmed; the formula of sediment carrying capacity transverse distribution in braided river has been established. Compared with the observed data and the computed value, it is shown that the formula can represent the law of sediment carrying capacity transverse distribution in braided river.