Effects of Groundwater Level Changes Associated with Coastline Changes in Coastal Wetlands

Effects of Groundwater Level Changes Associated with Coastline Changes in Coastal Wetlands
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地下水位变化对滨海湿地海岸线变化的影响

DOI:
10.1007/s13157-019-01253-9
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发表时间:
2020-01
期刊:
影响因子:
2
通讯作者:
Su Liya
Su Liya
中科院分区:
环境科学与生态学4区
文献类型:
--
作者:
Liu Qiang;Liang Liqiao;Yuan Xiaomin;Mou Xia;Su Liya

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人为和自然影响引起的水位线变化不可避免地改变了沿海湿地地下水位。在这项研究中,我们应用Visual MODFLOW(VMOD)来评估不同带状海岸线类型(例如,淤积,侵蚀和稳定区)对黄河三角洲(YRD),中国滨海湿地地下水位的影响。我们还讨论了地下水位变化的概念框架,在增生,侵蚀和稳定区。结果表明:(1)海滨地区地下水流场随海岸线的变化而变化,而西南上游地区和黄河沿岸地下水位高的地区也有类似的变化规律:(2)地下水位随泥沙淤积引起的土地面积的扩大而增加,而在侵蚀带地下水位略有下降的趋势;以及(iii)在大坝保护区内,沿海湿地地下水水位呈现出逐渐显著下降的趋势。我们发现,驱动地下水水位的机制明确地响应海岸线的改变,这些发现可以帮助我们了解海岸线如何影响淡水湿地的地下水,并有助于保持沿海湿地的完整性。
Coastline changes caused by anthropogenic and natural influences inevitably alter coastal wetland groundwater levels. In this study, we apply Visual MODFLOW (VMOD) to assess the influence of different zonal coastline types (e.g., accretion, erosion, and stable zones) on groundwater levels of a coastal wetland in the Yellow River Delta (YRD), China. We also discuss the conceptual framework of groundwater level variation in accretion, erosion, and stable zones. Results show that: (i) The groundwater flow field varied with coastline changes in this seaside region, while a similar variation pattern was also found in both the upper southwestern region and the riverside of the Yellow River where groundwater levels are high; (ii) groundwater levels increased with the expansion in land area caused by silting, while groundwater levels exhibited a slightly decreasing trend in the erosion zone; and (iii) coastal wetland groundwater levels exhibited a progressively and significantly decreasing trend in zones protected by a dam. We found that the mechanisms that drive groundwater levels clearly responded to coastline alteration, and such findings could help in our understanding of how coastlines influence groundwater in freshwater wetlands and aid in maintaining the integrity of coastal wetlands.
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