الأشكال الرملية على ساحل هضبة الدفنة فيما بين واديي الحريقة و المنستير الغربي بشمال شرق ليبيا : تحليل جيومورفولوجي باستخدام تقنيات الاستشعار عن بعد

الملخص EN

This study focused on the phenomenon of sandy forms in the Dafna plateau between the Harika and Western Monastir wades, in order to know their types, morphometric characteristics, geographical distribution, density, movement, and origin of their origin.

The satellite visibility classification of the Lansat 8 satellite showed that it consists of eight different shapes, which are the longitudinal, transverse, semicircular, and semicircular shackles bound by the plant, the inverted semicircular, and areas between the dunes and the caudal and dome nebula.

The general dune sand in the eastern range has a value of 4.31 sandy forms per 1 sq.

Km, while the western range has a general density of 8.44 sandy forms per 1 square kilometer.

The movement of sand shapes recorded the maximum in the western range, reaching 25 meters during a period of twenty-nine months, and at an annual rate of 10.34 meters annually.

As for the eastern range, it recorded a movement of 39 meters in a period of one hundred and twenty-eight months, and the average annual movement of sandy forms in this range was 3.65 meters annually.

It has been found by examining the grains of the various sandy shapes that the origin of their origin is marine, and this is enhanced by the fact that they contain more than 50% of the seashell and the marginal seashells.

The current sandy forms were formed by the wind after the prevailing drought conditions during the Holocene era, and the emergence of these forms during the greenhouse period is reinforced by the fact that there are no coherent sand dunes.