HR: 0800h
AN: OS21B-1215    [Abstracts]
TI: Experimental study of sediment transport along the central Mediterranean coast of Israel, by means of fluorescent sand tracers.
AU: * Klein, M
EM: m.klein@geo.haifa.ac.il
AF: Department of Geography and Environmental Studies, University of Haifa, University of Haifa, Haifa, 31905 Israel
AU: Zviely, D
EM: m.klein@geo.haifa.ac.il
AF: Department of Geography and Environmental Studies, University of Haifa, University of Haifa, Haifa, 31905 Israel
AU: Kit, E
EM: kit@eng.tau.ac.il
AF: Faculty of Engineering, Tel-Aviv University, Ramat-Aviv, Tel-Aviv, 69978 Israel
AU: Shteinman, B
EM: b_shtein@ocean.org.il
AF: Israel Oceanographic and Limnological Research, Yigal Allon Kinneret Limnological Laboratory, P.O. Box 345, Tiberias, 14102 Israel
AB: The method of labeled natural sand particles was used to study sediment transport along the central Mediterranean coast of Israel. Six portions of 300 kg each were tagged with various fluorescent colors and distributed at six different locations in the vicinity of the Herzliya Marina. The tagged sand was scattered at the end of autumn, and sampled three times during the winter. Sampling was interrupted in mid-January due to unexpected dredging at the marina canal entrance. The wave climate during that time was analyzed using wave data from Ashdod (40 km south). Wave directions measured in Ashdod were corrected, to make them applicable to the Herzliya coast, in accordance with the directional shift values suggested by Perlin and Kit (1999). Four wave storms with significant wave heights (Hs) of over 2.5 m were observed. Two of them clearly indicate a dominant direction from the southwest and two others from the northwest. However, the time durations and the relative angles between the wave directions and the orthogonal to the coast of the storms propagating from the southwest are essentially larger than those arriving from the northwest. The following results were noted: a) the drift of tagged sand particles correlated to longshore sediment transport (LST) at all depths was in a northern direction throughout the field experiment. The longest distance of transport was 5 km over a period of 62 days. b)"On-shore" sediment transport was presented, sand from 15 m depth was found at 8 m depth. c) The cross-shore sediment transport carried sand to a depth of 8 m, but no colored sand from shallow water (2-4 m) was found deeper than 8 m. d) although sedimentation at the marina entrance during the experiment was high, only small amounts of tagged sand were found at the entrance. e) findings of tagged sand showed the main area of sedimentation to be along the Marina's main breakwater.
DE: 3020 Littoral processes
DE: 3022 Marine sediments--processes and transport
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting