Evaluation of the impact of best management practices on ephemeral gully and sheet/rill erosion using the AnnAGNPS model

IF 5.4 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2024-10-12 DOI:10.1016/j.catena.2024.108436

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引用次数: 0

Abstract

To reduce the potential threat of soil loss due to ephemeral gullies, it is crucial to adopt Best Management Practices (BMPs) that prevent damage to landscapes by reducing sediments load. The current research evaluated the impact of five BMPs, including cover crops, grassed waterways, no-till, conservation tillage, and riparian buffer strips for reduction of sediment load from sheet/rill, and ephemeral gully erosion in an agricultural watershed in Southern Ontario, Canada. The study aimed to automatically calibrate AnnAGNPS using genetic algorithm and the most sensitive parameters of the model identified using a combination of Latin Hypercube Sampling (LHS) and One-At-a-Time (OAT) approach. It also utilized the calibrated model to simulate the effectiveness of BMPs in reducing the average seasonal and annual sediment loads from both sources of erosion (sheet/rill, and ephemeral gully) to determine the most effective practices. Riparian buffer strips were consistently successful in decreasing average seasonal sediment load of sheet/rill erosion, with an average reduction efficiency of 72 % in Spring, 64 % in Summer, 65 % in Fall, and 76 % in Winter. In terms of reducing average seasonal sediment load from ephemeral gully erosion, grassed waterways proved to be the most effective BMPs. They showed efficiency of 90 % in Spring; 83 % in Summer; 79 % in Fall; and 75 % in Winter. Considering the average annual sediment load, riparian buffer strips were consistently successful in decreasing average annual sediment load of sheet/rill erosion, with 69% reduction efficiency. Similarly, grassed waterways were the most effective BMPs for reducing average annual sediment load of ephemeral gully erosion, with an efficiency of 81 %. Additionally, grassed waterways were found to be the most efficient BMPs for reducing average annual total sediment load with reduction efficiency of 71 %. These results demonstrate the importance of implementing effective BMPs to address ephemeral gully erosion in watersheds where ephemeral gullies are the main source of erosion.

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利用 AnnAGNPS 模型评估最佳管理方法对短时沟壑和片状/钻状侵蚀的影响

为减少短时沟壑造成土壤流失的潜在威胁，必须采用最佳管理实践 (BMP)，通过减少沉积物负荷来防止景观受损。目前的研究评估了五种最佳管理实践的影响，包括覆盖作物、植草水道、免耕、保护性耕作和河岸缓冲带，以减少加拿大安大略省南部农业流域的片状/碾压和历时沟侵蚀造成的沉积物负荷。该研究旨在利用遗传算法自动校准 AnnAGNPS，并结合使用拉丁超立方采样 (LHS) 和一次性采样 (OAT) 方法确定模型中最敏感的参数。它还利用校准模型模拟了 BMP 在减少两种侵蚀源（片状/碾压和短流沟）的平均季节和年沉积负荷方面的效果，以确定最有效的做法。河岸缓冲带在减少片状/碾压侵蚀的平均季节性沉积物负荷方面一直很成功，春季的平均减少效率为 72%，夏季为 64%，秋季为 65%，冬季为 76%。在减少短时沟谷侵蚀造成的季节性平均沉积物负荷方面，植草水道被证明是最有效的 BMP。春季的效率为 90%，夏季为 83%，秋季为 79%，冬季为 75%。考虑到年均沉积物负荷，河岸缓冲带在减少片状/碾压侵蚀的年均沉积物负荷方面一直很成功，减少效率为 69%。同样，植草水道也是减少历时沟侵蚀年均沉积负荷最有效的 BMP，减少效率为 81%。此外，还发现植草水道是减少年均总沉积物负荷最有效的 BMP，减少效率为 71%。这些结果表明，在以短时沟壑为主要侵蚀源的流域，采用有效的 BMP 解决短时沟壑侵蚀问题非常重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.