Integrated time‐lapse geoelectrical imaging of wetland hydrological processes
Integrated time‐lapse geoelectrical imaging of wetland hydrological processes
复制标题
湿地水文过程的综合延时地电成像
DOI：
10.1002/2015wr017932
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发表时间：
2016
影响因子：
5.4
通讯作者：
J. Chambers
中科院分区：
文献类型：
--
作者：
S. Uhlemann;J. Sorensen;A. House;P. Wilkinson;C. Roberts;D. Gooddy;A. Binley;J. Chambers
湿地提供了重要的栖息地，在全球碳循环中至关重要，并作为关键的生态地球化学和水文缓冲区。这些服务的有效性主要是由水文过程，这可能是高度可变的空间和时间，由于结构的复杂性和季节性。已实施的二维地电监测数据的空间分析集成到传统的水文数据的解释，以提供在河岸湿地水文过程的详细了解。在泥炭中观察到两层水文系统。在泥炭的下部，从底层沉积物的更深的地下水的上涌被认为是在冬季/春季泥炭电阻率增加30%的驱动程序。在春季/夏季，由于植物蒸腾和/或微生物活动，近地表泥炭的电阻率下降了60%。层之间的水交换似乎只是在环绕地表水阶段出现大幅度下降后才开始的。这是第一次，我们证明了地电数据的自动解释可以用来量化垂直方向的地面运动。在这里，我们应用这种方法来量化膨胀土的收缩膨胀，影响水文参数，如孔隙度和渗透率。这项研究表明，水文和地球物理数据的综合解释可以显着提高湿地水文过程的理解。这种方法可以为生态系统服务的评价提供基础，并有助于湿地管理策略的优化。
Wetlands provide crucial habitats, are critical in the global carbon cycle, and act as key biogeochemical and hydrological buffers. The effectiveness of these services is mainly controlled by hydrological processes, which can be highly variable both spatially and temporally due to structural complexity and seasonality. Spatial analysis of 2‐D geoelectrical monitoring data integrated into the interpretation of conventional hydrological data has been implemented to provide a detailed understanding of hydrological processes in a riparian wetland. A two‐layered hydrological system was observed in the peat. In the lower part of the peat, upwelling of deeper groundwater from underlying deposits was considered the driver for a 30% increase in peat resistivity during Winter/Spring. In Spring/Summer there was a 60% decrease in resistivity in the near‐surface peats due to plant transpiration and/or microbial activity. Water exchange between the layers only appeared to be initiated following large drops in the encircling surface water stage. For the first time, we demonstrated that automated interpretation of geoelectrical data can be used to quantify ground movement in the vertical direction. Here, we applied this method to quantify shrink‐swell of expandable soils, affecting hydrological parameters, such as, porosity and permeability. This study shows that an integrated interpretation of hydrological and geophysical data can significantly improve the understanding of wetland hydrological processes. Potentially, this approach can provide the basis for the evaluation of ecosystem services and may aid in the optimization of wetland management strategies.