Hydro‐meteorological drivers influencing suspended sediment transport and yield in a semi‐arid mountainous basin,Earth Surface Processes and Landforms

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Hydro‐meteorological drivers influencing suspended sediment transport and yield in a semi‐arid mountainous basin
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2020-09-13 , DOI: 10.1002/esp.5001
A. Millares ₁ , A. Moñino ₁

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Understanding erosion and sediment transport dynamics is key for sustainable water resources management. The objective of this research was to assess suspended sediment responses, identifying relationships with hydro‐meteorological drivers, sediment sources and connectivity in a mountainous semi‐arid basin. With this purpose, suspended sediment concentrations of 12 events were measured by automatic sampling and classified based on six descriptors of hydro‐meteorological drivers, their related rating curves and hysteresis loop behaviour, and distribution of precipitation, snowfall and snowmelt. Comparison with sediment transport and yield along the river, previously reported, was also performed. The results allowed us to distinguish up to three types of events with different erosive responses, comparable with other Mediterranean environments and snowmelt‐driven basins. Events classified as type I and II were closely linked to snow processes. Those classified as type III presented higher sediment yield and negligible influence of snow processes. The analysis of rating curves and hysteresis loops confirmed the identified transport responses. Type I and II events, with clockwise behaviour, were related to in‐channel sediment storage. Type III events, with predominantly counter‐clockwise behaviour, were related to hillslope erosion processes of gullying and landslides. The sediment connectivity analysed highlights the role of vegetation cover and land uses, and its sensitivity in high mountainous environments, which fits with the observed sediment transport at the study site. The volume of sediment trapped in the bottomset area of a reservoir downstream was related to type I events (more frequent and of greater magnitude). However, spatial distribution and frequency of type III events are likely to become more relevant under future climate scenarios due to their high sensitivity to hydro‐meteorological drivers. These results highlight the vulnerability of high mountainous areas on erosive dynamics and justify long‐term monitoring as hotspots of future challenge for water resource management. © 2020 John Wiley & Sons, Ltd.

中文翻译：

水文气象驱动因素影响半干旱山区盆地悬浮泥沙的输送和产量

了解侵蚀和泥沙输送动力学是可持续水资源管理的关键。这项研究的目的是评估悬浮的泥沙响应，确定与山区半干旱盆地中水文气象驱动因素，泥沙源和连通性的关系。为此，通过自动采样对12个事件的悬浮沉积物浓度进行了测量，并根据水文气象驱动因素的6个描述符，它们的相关等级曲线和磁滞回线行为以及降水，降雪和融雪的分布进行了分类。还与先前报道的沿河的泥沙输送和产量进行了比较。结果使我们能够区分出三种类型的具有不同侵蚀反应的事件，可与其他地中海环境和融雪驱动盆地相媲美。分类为I型和II型的事件与降雪过程密切相关。那些被归为III类的沉积物具有较高的沉积物产量，而降雪过程的影响可以忽略不计。对额定曲线和磁滞回线的分析证实了已确定的传输响应。I型和II型事件具有顺时针行为，与河道内沉积物存储有关。III类事件主要表现为逆时针行为，与沟壑和山体滑坡的侵蚀过程有关。分析的沉积物连通性突出了植被覆盖和土地利用的作用，以及在高山环境中的敏感性，这与在研究地点观察到的沉积物运输相吻合。滞留在下游水库底部区域的泥沙量与I型事件有关（频率更高，震级更大）。但是，由于对水文气象驱动因素高度敏感，因此在未来的气候情景下，III型事件的空间分布和频率可能变得更加相关。这些结果突出了高山地区在侵蚀动力学方面的脆弱性，并证明长期监测是水资源管理未来挑战的热点。分级为4 +©2020 John Wiley＆Sons，Ltd. 这些结果凸显了高山地区在侵蚀动力学方面的脆弱性，并证明长期监测是水资源管理未来挑战的热点。分级为4 +©2020 John Wiley＆Sons，Ltd. 这些结果突出了高山地区在侵蚀动力学方面的脆弱性，并证明长期监测是水资源管理未来挑战的热点。分级为4 +©2020 John Wiley＆Sons，Ltd.

更新日期：2020-09-13

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