Anner Paldor, Einat Aharonov, Oded Katz

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Presentation transcript:

Anner Paldor, Einat Aharonov, Oded Katz Understanding steady-state Deep Submarine Groundwater Discharge: a case study in Northern Israel Anner Paldor, Einat Aharonov, Oded Katz EGU 2017, Vienna

Introduction - SGD can occur over different scales in the ocean. Bratton, J. F. (2010). The three scales of submarine groundwater flow and discharge across passive continental margins. J. Geol., 118(5), 565-575.

Introduction Deep Submarine Groundwater Discharge is ubiquitous, with important implications for Marine ecosystems, Fresh water budget, & Submarine slope instability. The mechanism for steady state DSGD not previously understood. Using numerical analysis of a case study, we suggest a new mechanism for steady-state DSGD.

Case study for DSGD: Achziv Canyon

Judea Group exposed in Achziv canyon at the hinge of the anticline Geological map and Kafri and Fleischer, 2003 EM-83-06 AS-04 Steinberg et al., 2011 ASHER-YAM-1 Seismic Hroizons Top Saqiye Base Saqiye Top Judea This structure is in good agreement with several other publications, among them: 1) Bakalowicz, M., El Hakim, M., and El-Hajj, A. (2008). Karst groundwater resources in the countries of eastern Mediterranean: the example of Lebanon. Env. Geol., 54(3), 597-604. 2) Schattner, U., Ben-Avraham, Z., Lazar, M., and Hüebscher, C. (2006). Tectonic isolation of the Levant basin offshore Galilee-Lebanon – effects of the Dead Sea fault plate boundary on the Levant continental margin, eastern Mediterranean. Journal of Structural Geology, 28(11), 2049-2066. 3) Seismic Hroizons Top Saqiye Base Saqiye Top Judea Structural map of Top Judea Group

Using FeFlow to model flow in the JG Aquifer Confining units X [km] This is, in effect, a modified and more realistic Henry problem (structured aquifer, semi-pervious units etc.). 1st type BC: head = 0.025*|Y| [m] ; C=35000 [mg/l] 2nd type BC: qin= rain flux [m/d] ; C=0 [mg/l]

Salinity [mg/l] Modeling predicts a smeared, shallow dipping, Fresh-Salt water Transition Zone in the aquifer. 500 Depth [m] 1000 1500 30 20 10 X [km]

Modeling predicts brackish, intense seepage from the outlet of the aquifer 0.89 m/d 150m

In contrast, when the flow is to a body of fresh water, almost no seepage occurs 0.89 m/d 150m

The intense seepage arises from a Gravity-Density Circulation Pump: recirculated SW constitutes most of the flow

Field validation of the model: research cruise along the Achziv canyon (20/12/2016) 5km Google Earth 25 km

Detrended salinity profile along the canyon shows a plume of anomalous low salinity Low salinity plume

Summary and Conclusions The Judea group aquifer is exposed by the Achziv canyon, ~10 km offshore. Numerical modeling predicts intense steady-state DSGD from it, even under low heads. Seepage is driven by density differences & occurs by seawater recirculation. A low salinity plume is measured in the canyon, in agreement with model prediction.

Thank you for your attention!