【摘要】 本文研究和探讨了黄河口拦门沙疏浚后,尾闾河道水位、流速和水面比降的变化以及疏浚部位的回淤过程。试验结果表明,河口拦门沙疏浚后,在一定时期和一定范围内,可以使尾闾河道发生溯源冲刷。在施放不同典型年的水沙条件下,尾闾河道可在疏浚点以上21～35km范围内发生溯源冲刷,同流量水位最大下降0 24～0 47m。同时,疏浚河槽始终处于回淤状态,经过一个汛期回淤量可达到70%～80%。更多还原

【Abstract】 Studies were made on changes of water stage, velocity and water surface slope in the lower river channel of the Yellow River after the mouth bar had been dredged. Back deposition in the dredged channel was also discussed. The experimental results demonstrated that the dredged mouth bar would result in a retrogressive erosion of the lower river channel upstream to the bar by a certain range from 21km to 35km above the dredging point. The water stage of same discharge would reduce 0.24～0.47m. The dredged channel was always in a state of deposition. The back deposition can reach 70%～80% of the retrogressive erosion after one flood season.更多还原