...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Evaluating trade-offs of a large, infrequent sediment diversion for restoration of a forested wetland in the Mississippi delta
【24h】

Evaluating trade-offs of a large, infrequent sediment diversion for restoration of a forested wetland in the Mississippi delta

机译：评估为恢复密西西比三角洲森林湿地而进行的大型，不经常的泥沙转移的权衡

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Flood control levees cut off the supply of sediment to Mississippi delta coastal wetlands, and contribute to putting much of the delta on a trajectory for continued submergence in the 21st century. River sediment diversions have been proposed as a method to provide a sustainable supply of sediment to the delta, but the frequency and magnitude of these diversions needs further assessment. Previous studies suggested operating river sediment diversions based on the size and frequency of natural crevasse events, which were large (5000 m(3)/s) and infrequent (active once a year) in the last naturally active delta. This study builds on these previous works by quantitatively assessing tradeoffs for a large, infrequent diversion into the forested wetlands of the Maurepas swamp. Land building was estimated for several diversion sizes and years inactive using a delta progradation model. A benefit-cost analysis (BCA) combined model land building results with an ecosystem service valuation and estimated costs. Results demonstrated that land building is proportional to diversion size and inversely proportional to years inactive. Because benefits were assumed to scale linearly with land gain, and costs increase with diversion size, there are disadvantages to operating large diversions less often, compared to smaller diversions more often for the immediate project area. Literature suggests that infrequent operation would provide additional gains (through increased benefits and reduced ecosystem service costs) to the broader Lake Maurepas-Pontchartrain-Borgne ecosystem. Future research should incorporate these additional effects into this type of BCA, to see if this changes the outcome for large, infrequent diversions. (C) 2018 Elsevier Ltd. All rights reserved.
机译：防洪堤切断了密西西比河三角洲沿岸湿地的泥沙供应，并为将大部分三角洲推上了轨道，从而在21世纪继续淹没。已经提出了将河流沉积物转移作为向三角洲提供可持续沉积物供应的方法，但是这些转移的频率和幅度需要进一步评估。先前的研究建议根据自然裂缝事件的大小和频率来进行河道泥沙分流，在最后一个自然活跃的三角洲中，自然裂缝事件的大小和频率大（> 5000 m（3）/ s）并且不频繁（每年活跃<一年一次）。这项研究是在这些先前工作的基础上，通过定量评估不经常转移到Maurepas沼泽的森林湿地中的权衡取舍的。使用三角洲转移模型估算了土地建设的几种转移规模和未使用年限。效益成本分析（BCA）将模型土地建设结果与生态系统服务评估和估计成本相结合。结果表明，土地建设与分流规模成正比，与非活动年数成反比。因为假定收益与土地获取成线性比例，并且成本随分流规模而增加，所以与直接项目区域更频繁地进行小分流相比，减少大分流的运行存在弊端。文献表明，不频繁的作业会（通过增加收益和减少生态系统服务成本）为更广阔的莫里帕斯-蓬查特兰-博恩湖生态系统带来更多收益。未来的研究应将这些额外的影响纳入这种类型的BCA中，以查看这是否会改变大规模，不频繁转移的结果。 （C）2018 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号