Long-Term Suspended Sediment Concentrations and Loads from a Relatively Undisturbed Agroforested Catchment in the Northwest of the Iberian Peninsula
| Autor: | M. Luz Rodríguez-Blanco, M. Mercedes Taboada-Castro, M. Teresa Taboada-Castro |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
suspended sediment dynamics
lcsh:Hydraulic engineering 010504 meteorology & atmospheric sciences 0208 environmental biotechnology Geography Planning and Development Drainage basin hydrology 02 engineering and technology Aquatic Science 01 natural sciences Biochemistry Hydrology (agriculture) lcsh:Water supply for domestic and industrial purposes sediment source Peninsula lcsh:TC1-978 0105 earth and related environmental sciences Water Science and Technology Hydrology geography lcsh:TD201-500 geography.geographical_feature_category biology Flooding (psychology) Sediment biology.organism_classification 020801 environmental engineering Freshwater fish Environmental science Surface runoff runoff events Sediment transport agroforested catchment |
| Zdroj: | Water, Vol 10, Iss 10, p 1302 (2018) Water Volume 10 Issue 10 |
| ISSN: | 2073-4441 |
| Popis: | The suspended sediment dynamics in small catchments are difficult to estimate accurately because they result from the coupling of complex processes occurring at different scales. In this study, the dynamics of suspended sediment concentrations (SSC) and loads were assessed in an agroforested humid catchment in NW Spain, based on a long-term rainfall, discharge and suspended sediment dataset (12 hydrological years) from high-frequency monitoring. The results highlight the episodic nature of sediment transport in the study area, given that about 78% of SS was exported over 10% of the study period. The SS transport was related to runoff generation and flooding, although sediment availability also played an important role in SS transport. The SS load was mainly driven by high-magnitude rainfall events, while intense rainfall episodes generated high SSC peaks. The mean annual suspended sediment yield was relatively low from a quantitative stand point (10 Mg km&minus 2 y&minus 1) however, during 11% of the monitoring, SS concentrations exceeding the threshold threatened surface water quality (Freshwater Fish Directive 78/659/EEC and Directive 75/440/EEC), mainly during runoff events, indicating the need to adopt management practices in order to reduce or mitigate sediment loss during such episodes. |
| Databáze: | OpenAIRE |
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