文章基本信息

标题：Simulating the effects of a beaver dam on regional groundwater flow through a wetland
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作者：Kathleen Feiner ; Christopher S. Lowry
期刊名称：Journal of Hydrology: Regional Studies
印刷版ISSN：2214-5818
出版年度：2015
卷号：4
页码：675-685
DOI：10.1016/j.ejrh.2015.10.001
出版社：Elsevier B.V.
摘要：Study Focus This research examines a wetland environment before and after the construction of a beaver dam to determine the hydrologic impacts on regional groundwater flow and quantify changes to the capture zone of a wetland pond. Increased hydraulic head behind a newly built beaver dam can cause shifts in the capture zone of a wetland pond. Changes in groundwater flux, and the extent of both the capture and discharge zones of this wetland were examined with the use of a groundwater flow model, created using MODFLOW. New hydrological insights for the region The construction of a beaver dam resulted in minimal changes to regional groundwater flow paths at this site, which is attributed to a clay unit underlying the peat, disconnecting this wetland from regional groundwater flow. However, groundwater discharge from the wetland pond increased by 90%. Simulating a scenario with the numerical model in which the wetland is connected to regional groundwater flow results in a much larger impact on flow paths. In the absence of the clay layer, the simulated construction of a beaver dam causes a 70% increase in groundwater discharge from the wetland pond and increases the surface area of both the capture zone and the discharge zone by 30% and 80%, respectively.
关键词：Beaver dam ; Ecological engineering ; Capture zone delineation ; MODFLOW ; Analytic element modeling