Is digital shoreline analysis system “fit” for gully erosion assessment?
Is digital shoreline analysis system “fit” for gully erosion assessment?
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DOI：
10.1016/j.catena.2021.105307
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发表时间：
2021-08
期刊：
影响因子：
6.2
通讯作者：
I. Nicu
中科院分区：
文献类型：
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作者：
I. Nicu
沟蚀是全球范围内最具破坏性的地貌过程之一。沟壑侵蚀测量的现代方法通常是从早期的技术中衍生出来的，这些技术已经过时了。技术能力的提高导致了量化土壤侵蚀过程（如沟侵蚀）的新方法，这些方法必须用于侵蚀评估。一个评估海岸侵蚀的工具-数字海岸线分析系统（DSAS），被应用于分析沟壑侵蚀。为了评估这项技术的实用性，我们选择了罗马尼亚摩尔达维亚高原的三种不同类型的沟渠（树突、线状和线状变成树突）。对不同参数（SCE、EPR、NSM和LRR）进行测试和分析。在树突沟壑的情况下，通过调整处理值（平滑距离设置为>1000，样带间距设置为>5 m），可以获得最佳结果。对于线性沟壑，需要将平滑距离设置为比树突状沟壑更小的值（<= 1000）。当线性沟壑演变为树突沟壑时，建议使用高值的平滑距离（>1000）和样带间距值> 10m。在DSAS的帮助下得到的平均侵蚀速率与罗马尼亚摩尔达维亚高原沟槽侵蚀的文献非常接近（在砂质和粘土沉积物中切割的沟槽分别超过1.5 m/年和低于1 m/年）。这使我们得出结论，DSAS工具“适合”沟侵蚀评估。然而，像任何其他软件一样，它也有局限性和可能的缺点。该工具可以成功地用于缓解土壤侵蚀、减少灾害风险、保护环境和文化遗产以及实现联合国可持续发展目标等领域。
Gully erosion represents one of the most destructive geomorphological processes at a global level. Modern methods of gully erosion measurement are typically derived from earlier techniques that have since become outdated. The increasing capabilities of technology had led to new ways of quantifying soil erosion processes (e.g. gully erosion) which must be used in erosion assessment. A tool designed to assess coastal erosion – Digital Shoreline Analysis System (DSAS), is applied to the analysis of gully erosion. To assess the usefulness of this technique, three different types of gullies were chosen (dendritic, linear, and linear that became dendritic) from the Moldavian Plateau of Romania were chosen. Different parameters (SCE, EPR, NSM, and LRR) were tested and analysed. The best results were obtained in the case of dendritic gullies with specific adjustments to the processing values (smoothing distance set to >1000 and transect spacing at values >5 m). In the case of linear gullies, the smoothing distance needs to be set to lower values compared to dendritic gullies (<= 1000). When it comes to the linear gully that evolved into a dendritic gully, the recommendation is to use smoothing distances with high values (>1000) and transect spacing values >10 m. The average erosion rates obtained with the help of DSAS are very close to the ones from the literature of gully erosion on the Moldavian Plateau in Romania (over – 1.5 m/yr and under – 1 m/yr for gullies cut in sandy and clay deposits, respectively). This leads us to the conclusion that the DSAS tool is “fit” for gully erosion assessment. However, like any other software, it has limitations and possible disadvantages. The tool can be successfully used and applied in the field of soil erosion mitigation, disaster risk reduction, environmental and cultural heritage protection and in reaching the UNSDG.