Predicting River Floodplain and Lateral Channel Migration for Salmon Habitat Conservation 1
Predicting River Floodplain and Lateral Channel Migration for Salmon Habitat Conservation 1
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预测河流泛滥平原和横向河道迁移以保护鲑鱼栖息地 1
DOI：
10.1111/j.1752-1688.2007.00063.x
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
T. Beechie
中科院分区：
文献类型：
--
作者：
Jason E. Hall;Damon M. Holzer;T. Beechie
摘要/ Abstract摘要：本文描述了一种预测哥伦比亚河流域82,900 km（按河岸面积计算为491 km2）河流洪泛区位置和潜在横向河道迁移的方法。预测是基于河道约束、河道坡度、堤岸宽度和堤岸深度，这些数据来源于数字高程和降水数据。在367平方公里（47,900公里）的低坡度河道（坡度≤4%）中，有一半（182平方公里，50%）被归类为洪泛平原河道，具有很高的横向迁移可能性。模型和现场测量的漫滩约束之间的分类一致性为85% (κ = 0.46, p < 0.001)，最大的误差来源是将非受限通道误分类为受限（遗漏误差为55%）。从航空照片中确定的预测通道迁移和横向迁移之间的分类一致性为76% (κ = 0.53, p < 0.001)，最大的误差来源是将横向迁移通道误分类为非迁移（35%的遗漏误差）。平均而言，更多的鲑鱼种群与横向迁移的渠道和洪泛平原有关，而不是局限或非迁移的渠道。这些数据对许多流域规划应用都很有用，包括确定土地使用对洪泛区栖息地的影响，以及所列鲑鱼或其他受关注物种有恢复潜力的地点。
Abstract: In this article, we describe a method for predicting floodplain locations and potential lateral channel migration across 82,900 km (491 km2 by bankfull area) of streams in the Columbia River basin. Predictions are based on channel confinement, channel slope, bankfull width, and bankfull depth derived from digital elevation and precipitation data. Half of the 367 km2 (47,900 km by length) of low‐gradient channels (≤ 4% channel slope) were classified as floodplain channels with a high likelihood of lateral channel migration (182 km2, 50%). Classification agreement between modeled and field‐measured floodplain confinement was 85% (κ = 0.46, p < 0.001) with the largest source of error being the misclassification of unconfined channels as confined (55% omission error). Classification agreement between predicted channel migration and lateral migration determined from aerial photographs was 76% (κ = 0.53, p < 0.001) with the largest source of error being the misclassification of laterally migrating channels as non‐migrating (35% omission error). On average, more salmon populations were associated with laterally migrating channels and floodplains than with confined or nonmigrating channels. These data are useful for many river basin planning applications, including identification of land use impacts to floodplain habitats and locations with restoration potential for listed salmonids or other species of concern.