Ecohydrologic Effects of Stream Restoration

作者: Jeffrey F. Mount

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摘要: Stream restoration efforts, particularly within meadow systems, increasingly rely on “pond and plug” type methods in which (a) alluvial materials are excavated from the floodplain, forming ponds; (b) used to plug incised channels; (c) smaller dimension channels restored floodplain surface. Despite large number of projects undertaken western United States, little research has been conducted evaluate quantify effects such topographic modification upon hydrology riparian vegetation these systems. To predict changes hydrologic processes distribution commonly found plant species a model suite individual models were concert. First we developed, calibrated validated 230 ha mountain along 3.6 km reach Bear Creek northeastern California, it simulate pre- post-restoration conditions. Next, data 170 plot locations distributed throughout study area combined with simulated water table depth time series develop for species. In each probability occurrence predicted as function growing season range. Last, jointly spatial Our results document three general responses effort: 1) increased groundwater levels volume subsurface storage; 2) frequency/duration inundation decreased magnitude flood peaks; 3) annual runoff duration baseflow. Vegetation modeling indicate an increase obligate wetland, facultative wetland species, well decrease upland This supports quantifies hypothesis that stream have capacity re-establish necessary sustain The utilized could be improve realistic objective setting similar environments, addition providing quantitative, science-based approach guide active re-vegetation efforts.

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