Magnitude and variations of groundwater seepage along a Florida marine shoreline
Magnitude and variations of groundwater seepage along a Florida marine shoreline
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佛罗里达海岸线地下水渗漏的幅度和变化
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
J. Chanton
中科院分区：
文献类型：
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作者：
J. Cable;W. Burnett;J. Chanton
地下水直接输入作为沿海海洋营养物和其他溶解成分的潜在来源正受到越来越多的关注。从1992年到1994年，我们用渗漏计对佛罗里达的圣乔治湾的渗漏进行了广泛的测量。记录了沿7公里长的海岸线和距离海岸1公里的空间和时间变化。在3条垂直于海岸和1条平行于海岸的断面上进行了测量。总体结果表明，渗漏量随着距离海岸（3个样带中的2个样带）的距离而减少，并且在来自近海岸沉积物的渗漏流中观察到实质性的时间和空间变异性。此外，月平均综合渗漏率的趋势与附近沿海气象站测得的降水模式相似。根据这些测量结果，我们估计，地下水渗入研究区域的幅度是相当大的，代表从0.23至4.4 m3/sec-1的流量通过沉积物，大约相当于第一级的春天。虽然目前还不清楚该地区在全球地下水排放方面的代表性如何，但它表明，在某些情况下，地下水流量与河流和泉水流量一样重要。我们的地下水排放率表明，地下水是一个重要的水文源项，这一地区，可能是重要的沿海生态地球化学以及。
Direct groundwater inputs are receiving increasingattention as a potential source of nutrients and otherdissolved constituents to the coastal ocean. Seepageinto St. George Sound, Florida was measuredextensively from 1992 to 1994 using seepage meters. Spatial and temporal variations were documented alonga 7-km stretch of coastline and up to 1 km from shore. Measurements were made at 3 transects perpendicular toshore and 1 transect parallel to shore. The generalresults indicated that seepage decreased with distancefrom shore (2 of 3 transects), and substantialtemporal and spatial variability was observed inseepage flow from nearshore sediments. In addition,trends in mean monthly integrated seepage rates weresimilar to precipitation patterns measured at a nearbycoastal weather station. Based on these measurements, weestimate that the magnitude of groundwater seepage intothe study area is substantial, representing from 0.23 to4.4 m3 ⋅ sec-1of flow through the sediments, approximately equivalentto a first magnitude spring. Although it is unknown howrepresentative this region is with respect to globalgroundwater discharge, it demonstrates thatgroundwater flow can be as important as riverine andspring discharge in some cases. Our subsurfacedischarge rates suggest groundwater is an importanthydrologic source term for this region and may beimportant to the coastal biogeochemistry as well.