
Offshore Sediment Transport on the Israeli Continental Shelf
Katz T.(1), Jaijel R.(1), Biton E.(1)
(1) Israel Oceanographic & Limnological Research Ltd., Tel-Shikmona, P.O.Box 8030, Haifa 31080, Israel
Recent studies show that offshore transport of organic and inorganic sediments from the Israeli continental shelf is fundamental to key biological, geological, and chemical processes in the adjacent deep sea. This transport occurs mainly during winter storms, either as nepheloid layers detaching near the shelf break or as turbidity currents descending the slope, primarily through small submarine canyons north of Atlit. However, the characteristics, dynamics, environmental drivers, and constraints of this offshore transport remain poorly characterized. During the winter of 2024–2025, oceanographic sensors were deployed at three moored stations across the shelf (25, 60, and 86 m water depth) along a diagonal transect between the ephemeral Wadi Oren outlet and the submerged Carmel head. Only four >2 m wave storm events occurred during this exceptionally dry and mild winter, and just one was accompanied by flood discharge from Wadi Oren. Following these storms, particle concentrations increased across the shelf, cascading from the shallow to the deep station. Resuspended sediment plumes generally propagated northwards but with significant westward component. Time lags between plume arrival at the shallow, 25 m station and the deepest station, at 86 m (near the shelf break) during three storms indicate mean westward (offshore) transport rate ranging 3.6–9.7 km d⁻¹. These rates are consistent with previously estimated ~10-day lags between storm events and the arrival of laterally transported sediments from the shelf to the DeepLev sediment traps, ~50 km offshore. While plume initiation was wave-driven, the flood associated with the second storm event appears to have prolonged the post-storm, high-turbidity phase. Continuing our observations into the wetter and more energetic winter of 2025–2026, but with a station placed inside one of the canyons, we aim to constrain the environmental conditions under which winter storms on the shelf generate turbidity currents that plunge down the slope. This is in addition to the more prevalent and lower energy requiring detachment of nepheloid-layer plumes at the shelf break.



