Cropland management versus dredging: An economic analysis of reservoir sediment management
Cropland management versus dredging: An economic analysis of reservoir sediment management
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DOI：
10.1080/10402381.2013.814184
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发表时间：
2013-07
影响因子：
1.5
通讯作者：
Craig M. Smith;Jeffery R. Williams;A. Nejadhashemi;S. Woznicki;J. Leatherman
中科院分区：
文献类型：
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作者：
Craig M. Smith;Jeffery R. Williams;A. Nejadhashemi;S. Woznicki;J. Leatherman
农田侵蚀已被确定为水库泥沙积聚的主要来源。人们越来越重视寻找最具成本效益的方法来控制土壤侵蚀，以减少水库沉积。在这项研究中，结合了堪萨斯州东北部塔特尔克里克湖流域的生物物理和经济模型，以确定实施替代农田管理策略来减少水库沉积物是否比疏浚更具成本效益。在塔特尔溪湖流域，我们发现，如果实施农业最佳管理实践（BMP）的边际成本达到每吨6.90美元，那么疏浚将成为经济上首选的替代方案。要满足这一成本，就需要以有针对性的、具有成本效益的方式实施过滤带和免耕种植形式的BMP，而不是以自愿采用的随机模式，这可能是某些流域采用BMP的特点。虽然水库疏浚显然是昂贵的，但我们的结果表明，按单位年化计算，它并不完全是成本过高的。
Abstract Erosion of agricultural cropland has been identified as a major source of sediment accumulating in water reservoirs. Emphasis is increasingly on finding the most cost-effective ways to control soil erosion to reduce reservoir sedimentation. In this study, biophysical and economic models for the Tuttle Creek Lake watershed in northeastern Kansas were integrated to determine if implementation of alternative cropland management strategies to reduce reservoir sediment are more cost-effective than dredging. In the Tuttle Creek Lake watershed, we found that if the marginal costs of agricultural best management practices (BMP) implementation become >$6.90/t of sediment reduction, then dredging becomes the economically preferred alternative. Meeting this cost requires that BMP in the form of filter strips and no-till cultivation are implemented in a targeted, cost-effective manner, not in a random pattern of voluntary adoption that may characterize BMP adoption in some watersheds. Although reservoir dredging is clearly expensive, our results show that it is not entirely cost-prohibitive on an annualized per unit basis.