Rapid geomorphic assessment walkabouts as a tool for stream mitigation monitoring

IF 2.6 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Jaime R. Goode, Robert J. Hawley, Robert H. Lewis, Bethany Mulhall
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Abstract

Monitoring of compensatory stream mitigation projects conventionally relies on spatially discrete geometric data and habitat assessments collected from representative reaches. Project success is evaluated by extrapolating site-scale metrics such as rapid bioassessment protocol (RBP) scores and time-series changes in width-to-depth ratios to adjacent reaches. For example, an excellent RBP score at one location is used to infer excellent habitat in nearby reaches. This paper compares spatially discrete and continuous monitoring data from 38 km of restored stream length on a stream mitigation project in central Kentucky to document how conventional site-level metrics may not represent conditions in adjacent reaches, particularly on projects plagued by post-construction geomorphic instability (e.g., headcut migration, propagation of bank erosion, and chute cutoff formation). Over a 5-year monitoring period, rapid visual assessment walkabouts documented project-scale geomorphic process trajectories that were not captured by conventional site-specific monitoring. Early detection of geomorphic instability from this rapid monitoring approach facilitated cost-effective and tailored adaptive management (e.g., planting of live stakes to arrest bank erosion). Full-census walkabouts can thereby help to improve mitigation credit valuation, enhance long-term habitat protection, and facilitate successful steam restoration outcomes.

Abstract Image

作为溪流缓解监测工具的快速地貌评估徒步旅行
对补偿性溪流缓解项目的监测通常依赖于从代表性河段收集的空间离散几何数据和生境评估。评估项目成功与否的方法是,将快速生物评估协议(RBP)得分和宽深比的时间序列变化等现场尺度指标推断到邻近河段。例如,如果某个地点的 RBP 得分很高,就可以推断出附近河段的栖息地很好。本文比较了肯塔基州中部一个溪流缓解项目中 38 公里恢复溪流长度的空间离散和连续监测数据,以记录传统的场地级指标如何可能无法代表邻近溪流的状况,尤其是在受施工后地貌不稳定性(如溪头迁移、河岸侵蚀扩展和滑道形成)困扰的项目中。在为期 5 年的监测期间,快速目测评估步行记录了项目规模的地貌过程轨迹,而这些轨迹是传统的特定地点监测无法捕捉到的。通过这种快速监测方法及早发现地貌的不稳定性,有助于进行具有成本效益的、有针对性的适应性管理(例如,种植活桩以阻止河岸侵蚀)。因此,全面普查徒步考察有助于提高缓解信用评估、加强长期栖息地保护并促进蒸汽恢复成果的成功。
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来源期刊
Journal of The American Water Resources Association
Journal of The American Water Resources Association 环境科学-地球科学综合
CiteScore
4.10
自引率
12.50%
发文量
100
审稿时长
3 months
期刊介绍: JAWRA seeks to be the preeminent scholarly publication on multidisciplinary water resources issues. JAWRA papers present ideas derived from multiple disciplines woven together to give insight into a critical water issue, or are based primarily upon a single discipline with important applications to other disciplines. Papers often cover the topics of recent AWRA conferences such as riparian ecology, geographic information systems, adaptive management, and water policy. JAWRA authors present work within their disciplinary fields to a broader audience. Our Associate Editors and reviewers reflect this diversity to ensure a knowledgeable and fair review of a broad range of topics. We particularly encourage submissions of papers which impart a ''take home message'' our readers can use.
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