Temporal variability in the relationships between precipitation, discharge and suspended sediment concentration in a small Mediterranean mountain catchment

被引：51

作者：

Lana-Renault, N. ^{[1
]}

Regues, D. ^{[1
]}

Marti-Bono, C. ^{[1
]}

Begueria, S. ^{[1
]}

Latron, J. ^{[1
]}

Nadal, E. ^{[1
]}

Serrano, P. ^{[1
]}

Garcia-Ruiz, J. M. ^{[1
]}

机构：

[1] CSIC, Inst Pirenaico Ecol, E-50080 Zaragoza, Spain

来源：

NORDIC HYDROLOGY | 2007年 / 38卷 / 02期

关键词：

antecedent humidity; Central Spanish Pyrenees; experimental catchment; floods; sediment sources; suspended sediment; CENTRAL SPANISH PYRENEES; ABANDONMENT;

D O I：

10.2166/nh.2007.003

中图分类号：

TV21 [水资源调查与水利规划];

学科分类号：

081501 ;

摘要：

Relationships between discharge and suspended sediment are very complex in most Mediterranean catchments. In the case of the Arnas catchment (Central Spanish Pyrenees), with a long history of human activity, the main factors that explain the variability of suspended sediment concentration (SCC) during floods are the peak flow and the intensity of precipitation. A cluster analysis distinguishes four types of floods according to different characteristics of precipitation, discharge, suspended sediment transport and antecedent moisture conditions. G1 and G2 floods occur under dry conditions (which prevail most of the year), with moderate rainfall and low precipitation intensity; the discharge and suspended sediment response are very fast but limited in intensity. This suggests that the origin of water and sediment is restricted to areas located very close to the channel. G3 floods also occur under dry conditions, although during intense rainfall events; then the response in both discharge and suspended sediment is very high, showing an enlargement of the contributing areas. Under very wet conditions (G4 floods) relatively moderate precipitation produces a very high response in discharge, but suspended sediment concentration records moderate values due to the effect of dilution when the entire catchment is contributing.

引用

页码：139 / 150

页数：12

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