השפעת המצוק החופי על חדירת חול איאולי למישור החוף הדרומי של ישראל

Research output: Contribution to journalArticlepeer-review

Abstract

The effect of sea cliff on aeolian sand encroachment inland was monitored by measurements of the sand transport by traps and wind flow that is affected by the topography of the cliffs. Measurements were carried out on two cliffs in the southern Coastal Plain of Israel, one 160 m long and the second 240 m, with front slope inclination of 30° 40° and heights of 22-25 m. Results show that sand is incapable of climbing even moderate cliff slopes of 10° to 15°. The storm wind impinges the cliffs at angles of 45° to 50° to the brim of the cliffs and is diverted to flow in a helical pattern parallel to the shoreline along the front slope of the cliffs. The diverted sand-moving wind is again deflected at the northern end of the cliffs where its magnitude abates and deposits sand that is carried along the beach. The flow of the wind on the beach parallel to the cliff foot conduces a long fetch in which sand transport is eventually saturated when it arrives at an equilibrium with the shear stress of the wind. The wind is accelerated along this fetch, hence the growth in sand transport is related both to the length of the fetch and wind acceleration. A state of equilibrium is achieved after a length of 150-200 m along the front slopes of the cliffs.
Original languageHebrew
Pages (from-to)155-168
Number of pages14
Journalאופקים בגאוגרפיה
Volume31
StatePublished - 1990

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