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首页> 外文期刊>Land Degradation and Development >Contrasting suspended sediment export in two small agricultural catchments: Cross-influence of hydrological behaviour and landscape degradation or stream bank management
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Contrasting suspended sediment export in two small agricultural catchments: Cross-influence of hydrological behaviour and landscape degradation or stream bank management

机译：对比悬浮沉积物出口两种小型农业集水区：水文行为的交叉影响和景观退化或流银行管理

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The study aimed to identify hydrological and landscape factors that influence sediment transport in 2 agricultural catchments in north-western FranceMoulinet and Kervidy-Naizinwith the same climate, size, and bedrock but with contrasting suspended sediment (SS) fluxes. Discharge and SS concentrations were continuously monitored at the catchment outlets for 9 hydrological years. Data were examined at annual, seasonal, and individual storm-flow event scales. Storm events were classified into 3 typessingle small, successive, and major eventswhose effect on sediment transport was studied. At the annual scale, SS yields were higher in Moulinet (16-63x10(3)kgkm(-2)) than in Kervidy-Naizin (3-22x10(3)kgkm(-2)) despite similar water fluxes. However, Kervidy-Naizin had higher potential for hillslope erosion because of more frequent occurrence of saturation excess runoff, more frequent bare soil in cultivated area, and fewer hedgerows. Major storm events were also stronger in this catchment. Although high SS concentrations and fluxes occurred only during a few major events in Kervidy-Naizin, SS export was always substantial throughout the year in Moulinet. We hypothesised that bank degradation due to cattle trampling generated the higher SS export in the Moulinet catchment. This hypothesis was confirmed by the large decrease in SS fluxes following construction of watering troughs in the middle of the study period. In the Kervidy-Naizin catchment, natural woody vegetation or grass buffer strips along the stream effectively protect the stream from bank erosion or a possible influx of hillslope erosion particles, except during some major events in winter.
机译：该研究旨在识别影响北西方（西北北部）和Kervidy-Naizin的沉积物运输的水文和景观因素，以及相同的气候，大小和基岩，但具有对比悬浮沉积物（SS）助熔剂。在流域出口中连续监测排放和SS浓度9水文岁月。在年度，季节性和单个风暴流动事件尺度审查数据。风暴事件被分为3个小，连续的，以及研究沉积物运输的主要活动。尽管类似的水通量，但在年度规模中，SS产量比在Kervidy-Naizin（3-22×10（3）kgkm（-2））中较高，仍高于Kervidy-Naizin（3-22×10（3）kgkm）。然而，Kervidy-Naizin对山坡侵蚀的潜力具有更高的潜力，因为饱和过量径流越来越频繁发生，耕地面积更频繁的裸土，以及较少的HEDGEROWS。这一流域的主要风暴事件也更加强大。虽然只有在Kervidy-Naizin的一些重大事件中发生了高度SS浓度和助势，但SS Export在Moulinet的一年中总是很重要。我们假设由于牛踩踏而导致的银行退化产生了Moulinet集水区的较高的SS出口。通过在研究期间构建浇水槽后SS助熔剂的大幅减少证实了该假设。在Kervidy-Naizin集水区内，除了在冬季的一些重大事件期间，自然木质植被或草地缓冲区沿着溪流的河流侵蚀或可能的山坡侵蚀颗粒的涌入。

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