Terrain analysis, erosion simulations, and sediment fingerprinting: a case study assessing the erosion sensitivity of agricultural catchments in the border of the volcanic plateau of Southern Brazil
Terrain analysis, erosion simulations, and sediment fingerprinting: a case study assessing the erosion sensitivity of agricultural catchments in the border of the volcanic plateau of Southern Brazil
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DOI：
10.1007/s11368-022-03139-6
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发表时间：
2022-01
影响因子：
3.6
通讯作者：
A. Dambroz;J. Minella;T. Tiecher;J. M. Moura-Bueno;O. Evrard;F. A. Pedron;R. S. Dalmolin;F. Bernardi;F. Schneider;O. Cerdan
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作者：
A. Dambroz;J. Minella;T. Tiecher;J. M. Moura-Bueno;O. Evrard;F. A. Pedron;R. S. Dalmolin;F. Bernardi;F. Schneider;O. Cerdan
目的在巴西南部火山高原的边界，在三个农业水源集水区的侵蚀及其空间分布进行了评估。我们分析了地形，水文过程和土地利用的影响，以提供一个全面的评估集水区的敏感性侵蚀。MethodsTopographic属性从数字高程图获得，WaterSed模型参数化模拟径流，扩散侵蚀，和产沙量，和泥沙来源的贡献估计使用沉积物指纹的基础上近红外光谱。农田、草地覆盖的地区和排水网络附近的地区对侵蚀最为敏感。短距离从源到河流网络和高强度降雨事件（80毫米）的发生促进增加径流/泥沙转移的连接。侵蚀模拟表明，低渗透的地区，如未铺砌的道路，是重要的径流发电机在较低的降雨量事件（25毫米）。沉积物指纹分析提供了令人满意的结果来量化未铺设道路对沉积物的贡献（~ 39%）。表土和河道也显着的沉积物来源的一组分析的样品，对应的平均贡献为38%和23%，分别conclusionAreas共享地貌相似性并没有导致类似的沉积物的贡献。植被覆盖控制了地形敏感地区的侵蚀。未铺砌的道路是一个重要的沉积物来源，其次是表土和河道。互补的结果提供了有用的见解，以更好地协调规划环境保护战略，在这些脆弱的景观。
PurposeErosion and its spatial distribution in three agricultural headwater catchments were assessed in the border of the volcanic plateau in Southern Brazil. We analyzed terrain, hydrological processes, and land use influence to provide a comprehensive assessment of the catchments’ sensitivity to erosion.MethodsTopographic attributes were acquired from a digital elevation map, WaterSed model was parameterized to simulate runoff, diffuse erosion, and sediment yield, and sediment source contributions were estimated using sediment fingerprinting based on near-infrared spectroscopy.ResultsAccording to the modeled results, areas covered by crop fields, grasslands, and those adjacent to the drainage network are the most sensitive to erosion. Short distances from the source to the river network and the occurrence of high magnitude rainfall events (80 mm) promoted increases in connectivity for runoff/sediment transfer. Erosion simulations show that areas of low infiltration, such as unpaved roads, were important runoff generators during lower volume rainfall events (25 mm). Sediment fingerprinting provided satisfactory results to quantify the contributions of unpaved roads to sediment (~ 39%). Topsoil and stream channels were also significant sediment sources for the set of analyzed samples, corresponding to average contributions of 38 and 23%, respectively.ConclusionAreas sharing geomorphological similarities did not lead to similar sediment contributions. Vegetation cover controlled erosion in topographically sensitive areas. Unpaved roads provide a significant sediment source, followed by topsoil and stream channels. The complementary results provide useful insights to better coordinate planning environmental conservation strategies in these fragile landscapes.