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分析了黄河内蒙古巴彦高勒-三湖河口和三湖河口-头道拐河段洪水期冲淤变化与水沙组合因子的响应关系,结果表明,两河段洪水期单位水量冲淤量与来沙系数的相关关系最密切。上段1952-1968年、1969-1986年和1987-2012年三个时段其相关系数分别达到0.83、0.80和0.94,都有随着来沙系数增加单位水量淤积量增加的趋势,洪水期冲淤临界来沙系数分别为0.0040kg·s/m6、0.0046kg·s/m6和0.0063kg·s/m6;下段1952-1968年和1987-2012年两个时段其相关系数分别达到0.96和0.84,洪水期冲淤临界来沙系数分别为0.0055kg·s/m6和0.0050kg·s/m6。对于上段洪水期,当平均含沙量大于10kg/m3时,各级流量洪水都发生淤积;当平均含沙量小于7kg/m3时,各级流量洪水都发生冲刷。
The relationship between the scouring and depositional changes in the Bayanjale - Sanhuhekou and Sanhuhekou - Toudaohe reach of the Yellow River in flood season and the combination of water and sediment was analyzed. The results show that The correlation coefficient of the coefficient of arrival to the sand is the most close. The correlation coefficients of the three periods from 1952 to 1968, from 1969 to 1986 to 1987 to 2012 were 0.83, 0.80 and 0.94, respectively. Both of them had a tendency of increasing siltation per unit of sediment yield, The coefficient of sediment yield was 0.0040kg · s / m6, 0.0046kg · s / m6 and 0.0063kg · s / m6, respectively. The correlation coefficients between the next two periods of 1952-1968 and 1987-2012 were 0.96 and 0.84, The critical sediment-deposition rates are 0.0055kg · s / m6 and 0.0050kg · s / m6, respectively. For the upper flood period, when the average sediment concentration is more than 10kg / m3, all levels of floods and silt deposits occur; when the average sediment concentration is less than 7kg / m3, all levels of floods occur.