摩洛哥索维拉省不同类型海岸沙丘的形态特点与沙量估算2.-[自动保存的].ppt

* * * * * Spatial patterns in Essaouira South 4-Results 5-Conclusion And Discussion This process is less important, the foredunes being very narrow and not stabilized by fences. Basic typologies include coppice dunes, sand shadows and small tongue-like dunes 4-Results 5- Conclusion And Discussion Conceptual model and sediment transfer volumes It includes the main processes involved in dune formation and migration as a function of differential relative rates of sedimentation and erosion. The model considers only the three main dune categories: ( 1) Active dunes (AD) (2) Vegetated dunes (VD) (3) Intrusive dunes (ID) 4-Results 5- Conclusion And Discussion Conceptual model and sediment transfer volumes Fig. Satellite image showing the major ac-tive sediment transport zones, their relative sediment volumes, and the sediment supply areas in the southern-most section of the study area. Note that the actual sediment sources are the upwind beaches that, in turn,are fed by the N–S littoral drift. 4-Results 5- Conclusion And Discussion Conceptual model and sediment transfer volumes Fig. 8 Conceptual diagram illustrating the coast-parallel, southward dune mi-gration(aklés and crescent-shaped barchans) E, N and NE of Cape Sim based on satellite imagery. The colour bars represent spe-cific sand volumes listed in the legend 4-Results 5- Conclusion And Discussion Conceptual model and sediment transfer volumes Table 1 .Volumes of active, vegetated and intrusive dunes in the different sectors of the Essaouira dune field. 5- Conclusion And Discussion The coast receives abundant sediment in the north but increasingly less towards the south, and also in areas where the dune fields have been significantly modified by man. In addition, aeolianite outcrops along the beach locally influence sediment availability. Conclusion 5- Conclusion And Discussion The northern dune field is 9 km long and lined by a wide artificial foredune complex fi