Geological controls on submarine groundwater discharge in Long Bay, South Carolina (USA)

被引：14

作者：

Viso, Richard ^{[1
]}

McCoy, Clay ^{[1
]}

Gayes, Paul ^{[1
]}

Quafisi, Dimitri ^{[1
]}

机构：

[1] Coastal Carolina Univ, Ctr Marine & Wetland Studies, Conway, SC 29526 USA

来源：

CONTINENTAL SHELF RESEARCH | 2010年 / 30卷 / 3-4期

关键词：

SGD; Electrical resistivity; Seismic; Continental shelf; NORTH-CAROLINA; SUBTERRANEAN ESTUARY; COASTAL ZONE; WATER;

D O I：

10.1016/j.csr.2009.11.014

中图分类号：

P7 [海洋学];

学科分类号：

0707 ;

摘要：

A combination of geophysical methods including continuous electrical resistivity and high-resolution Chirp sub-bottom profiling were utilized to characterize geologic controls on pore fluid salinity in the nearshore of Long Bay, SC. Resistivity values ranged from less than 1 Q m to greater than 40 92 m throughout the bay. Areas of elevated electrical resistivity suggest the influence of relatively fresher water on pore water composition. Geophysical evidence alone does not eliminate all ambiguity associated with lithological and porosity variations that may also contribute to electrical structure of shallow marine sediments. The anomalous field is of sufficient magnitude that lithological variation alone does not control the spatial distribution of elevated electrical resistivity zones. Geographical distribution of electrical anomalies and structures interpreted from nearby sub-bottom profiles indicates abrupt changes in shallow geologic units control preferential pathways for discharge of fresh water into the marine environment. Shore parallel resistivity profiles show dramatic decreases in magnitude with increasing distance from shore, suggesting a significant portion of the terrestrially driven fresh SGD in Long Bay is occurring via the surficial aquifer within a few hundred meters of shore. (c) 2009 Elsevier Ltd. All rights reserved.

引用

页码：335 / 341

页数：7

共 37 条

[1]

AUCOTT WR, 1410E US GEOL SURV, P83

[2]

BALDWIN WE, 2006, GSA B, V118

[3]

BALDWIN WE, 20041013 US GEOL SUR

[4]

BARNHARDT WA, 2009, 1339 US GEOL SURV, P77

[5] Composition and flux of groundwater from a California beach aquifer: Implications for nutrient supply to the surf zone [J].

Boehm, AB ;

Paytan, A ;

Shellenbarger, GG ;

Davis, KA .

CONTINENTAL SHELF RESEARCH, 2006, 26 (02) :269-282

[6] Detecting submarine groundwater discharge with synoptic surveys of sediment resistivity, radium, and salinity [J].

Breier, JA ;

Breier, CF ;

Edmonds, HN .

GEOPHYSICAL RESEARCH LETTERS, 2005, 32 (23) :1-4

[7] Quantifying submarine groundwater discharge in the coastal zone via multiple methods [J].

Burnett, W. C. ;

Aggarwal, P. K. ;

Aureli, A. ;

Bokuniewicz, H. ;

Cable, J. E. ;

Charette, M. A. ;

Kontar, E. ;

Krupa, S. ;

Kulkarni, K. M. ;

Loveless, A. ;

Moore, W. S. ;

Oberdorfer, J. A. ;

Oliveira, J. ;

Ozyurt, N. ;

Povinec, P. ;

Privitera, A. M. G. ;

Rajar, R. ;

Ramassur, R. T. ;

Scholten, J. ;

Stieglitz, T. ;

Taniguchi, M. ;

Turner, J. V. .

SCIENCE OF THE TOTAL ENVIRONMENT, 2006, 367 (2-3) :498-543

[8] Estimating the dynamics of groundwater input into the coastal zone via continuous radon-222 measurements [J].

Burnett, WC ;

Dulaiova, H .

JOURNAL OF ENVIRONMENTAL RADIOACTIVITY, 2003, 69 (1-2) :21-35

[9] Groundwater and pore water inputs to the coastal zone [J].

Burnett, WC ;

Bokuniewicz, H ;

Huettel, M ;

Moore, WS ;

Taniguchi, M .

BIOGEOCHEMISTRY, 2003, 66 (1-2) :3-33

[10] Oxidative precipitation of groundwater-derived ferrous iron in the subterranean estuary of a coastal bay [J].

Charette, MA ;

Sholkovitz, ER .

GEOPHYSICAL RESEARCH LETTERS, 2002, 29 (10) :85-1

← 1 2 3 4 →