摘要
黄河下游河道的冲淤为沿程冲淤与溯源冲淤综合作用的结果。沿程冲淤主要与河流流量及含沙量的变化有关，而溯源冲淤是由于河流下游基准面的变化，主要为河长的改变引起。这样，黄河下游河道的冲淤可用一包括流量、含沙量及河长三个指标的多元线性方程来拟合。根据１９５０－１９９２年黄河下游各站３０００ｍ￣３／ｓ水位的年变化数据、黄河尾闾各年汛后的河长及年平均流量、年平均含沙量等资料，利用多元线性回归的方法分析黄河下游各站的冲淤变化，结果表明这一方法在黄河下游各河段应用效果较好。反映出沿程冲淤的影响，在洛口以上河段是显著的，并且为主要影响因素；溯源影响则在利津以下河段是显著的，影响程度超过沿程冲淤。
The aggradation and degradation of the river bed in the Yellow River lower reachesare the coaction of the down stream influence and the retrogressive influence,The downstream influence is mainly caused by discharge and concentration of the coming river wa-ter. The retrogressive influence stems from the changes of the river length.So,the evolu-tion of the river bed can be expressed with a multiple linear equation including these 3factors.The data used to solve the equations are from 1950a to 1992 a,including the annualwater discharge and concentration of Lijin Station,the annual river length after flood,and the water levels at a certain discharge of 3000m￣3/s in 6 stations of the Yellow Riverlower reaches,The regressive equations in every station are remarkable in the standardof 0.05.It proves this method effective.By comparing the standard regressive coefficients,it can be testified that the waterdischarge and the river length are the major factors,while the water concentration is notremarkable to the equations. That is,the evolution of the river bed is mainly caused bythe changes of water discharge and the river length.The regresssion equations yield rea-sonable results,which indicate that the down stream influence decreases from the upperpart of the river reaches to the lower part,and the retrogressive influence increases.Thedown stream influence is dominant in the reach upper than Luokou(including Luokou),and the retrogressive influence is the principal factor in the reach lower than Lijin(in-cluding Lijin).
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1996年第4期55-61,共7页
Marine Geology & Quaternary Geology
基金
山东省青年自然科学基金
关键词
沿程冲淤
溯源冲淤
多元线性回归
黄河下游
down stream influence retrogressive influence multiple linear re-gression Yellow River lower reaches
