Sediment rating and annual cycles of suspended sediment in German upland rivers

被引:2
|
作者
Bloethe, Jan [1 ]
Hillebrand, Gudrun [2 ]
Hoffmann, Thomas [2 ]
机构
[1] Univ Bonn, Dept Geog, Meckenheimer Allee 166, D-53115 Bonn, Germany
[2] Fed Inst Hydrol, Mainzer Tor 1, D-56068 Koblenz, Germany
来源
NINTH INTERNATIONAL CONFERENCE ON FLUVIAL HYDRAULICS (RIVER FLOW 2018) | 2018年 / 40卷
关键词
RAINFALL EROSIVITY;
D O I
10.1051/e3sconf/20184004020
中图分类号
TV21 [水资源调查与水利规划];
学科分类号
081501 ;
摘要
Sediment flux of lowland rivers is dominated by suspended transport, but data is often sparse and analysis largely relies on rating relationships. However, suspended sediment concentration is by no means constant in both, space and time. Here we analyse the variability of sediment rating curves and the seasonality of suspended sediment concentration in German waterways, as recorded by 10 gauging stations with catchment areas between 2600 - 22000 km(2). Our data reveal a distinct break in power-law scaling relationships for all stations, with increased scaling exponents above threshold discharges close to the geometric mean. We attribute this mainly to the activation of sediment sources that resist mobilisation at lower flows. Furthermore, all stations show a counter-clockwise hysteresis effect throughout the year, where summer discharges have a higher sediment load than comparable winter discharges. Though the reasons for this pattern need further investigation, preliminary results show a strong correlation with rainfall erosivity and land-use parameters.
引用
收藏
页数:8
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