海河流域典型河流沉积物粒度特征及分布规律

为了解海河流域典型河流沉积物粒度参数空间分布规律,对海河典型河流的表层沉积物进行采集并利用Mstersize2000激光粒度仪进行粒度分析。结果表明,海河典型河流沉积物平均粒径差异显著,分选状况总体较差;山区水系与平原水系相比,沉积物平均粒径减小,呈集中分布,水动力减弱;山区自北向南变化明显,水系沉积物平均粒径减小,分布集中化,分选状况变差,由极正偏-正偏,向对称方向变化,峰度向平坦方向趋近,水动力减弱,符合粒径自然变化规律;平原区水系沉积物粒径参数表明南北变化不明显,因受较多支流、河流-湖泊-洼淀湿地等复杂系统和人为干扰强烈的影响,南北无显著变化规律。总的来说,海河流域河流受人为干扰强度较大,河流沉积物源较为复杂,栖息地物理完整性差。

Grain size characteristics and distribution regularities of typical river sediments in Haihe River Basin

In order to understand the spatial distribution of grain size parameters of typical river sediments in Haihe River Basin, the surface sediments of the typical rivers in Haihe River Basin were collected and analyzed with the Mstersize 2000 laser particle size analyzer. The results show that the average grain size of the typical river sediments in Haihe River is significantly different, and the sorting condition is generally poor. Compared with the plain water system, the average grain size of the sediments in the mountainous area is reduced, and the hydrodynamics is weakened. The change of the particle size of the sediments in the mountain area from north to south is obvious, and the average grain size of stream sediment decreases and the distribution is concentrated, sizing condition changes from extreme positive to positive and symmetric, and the kurtosis tends to be flat, the hydrodynamic is weakened. Such change is in accordance with the natural variation of the grain size. However, the grain size parameters of the sediments in the plain water system show that the change between north and south is not obvious. Because of the strong influence of the complex system of many tributaries, rivers, lakes, wetlands and human disturbance, there is no significant change in the north and South. Generally speaking, the intensity of human disturbance is higher in Haihe River basin, the source of river sediment is quite complex, physical integrity of the habitat is poor.