La Banya spit, located at the south of River Ebro Delta, is a sandy formation, developed by annexation bars forming successive beach ridges, which are oriented and modeled eastern southern waves. The initial ridges run parallel to coastline, above them small dunes developed, crests dominant winds, foredune barchans. This study attempted test number techniques in order understand dune dynamic on...

In this work, we present measurements of the height profile, wind velocity and sand flux performed on transverse dunes in the dune field known as “Lençóis Maranhenses”, northeastern Brazil. From the measured profile, we selected one dune to measure the air shear stress and the sand flux and compared the results with the theoretical predictions from a dune model in two dimensions recently introd...

[1] We present a new 3-D cellular automaton model for bed form dynamics in which individual physical processes such as erosion, deposition, and transport are implemented by nearest neighbor interactions and a time-dependent stochastic process. Simultaneously, a lattice gas cellular automaton model is used to compute the flow and quantify the bed shear stress on the topography. Local erosion rat...

Study of three Barchan sand dunes in Na'ama area southeast Tikrit city have been carried out for (10) samples, the investigation included petrographical, mineralogical and geochemical aspects from grain size point, grains are commonly sub-rounded to sub-angular forming about (98.8%) with (1.2%) mud. Petrographically, sub-litharenite lithic arenite analysis indicated that most mainly consist qua...

Dunes composed of granular materials are present in deserts and other environments, such as subaqueous environments on planets, with very different time length scales for their evolution. In arid regions, barchans (transverse dunes) develop under a unimodal wind regime, oriented perpendicular to the sand transport direction, whereas linear (longitudinal) dunes bimodal regime parallel direction....

The transgressive dunefield of the Lagoa de Peixe Natural Park was modified drastically due to intensive pine plantation and leeward development associated degraded areas. present study analyzed disturbances in do tree impact subsequent deforestation program conducted region. Aerial photographs, satellite images, DGPS topographic data collected over a 70-year-long period were retrieved, analyze...

Dynamic changes of aeolian landforms under changing environments in a middle-latitude desert belt is typical problem climate change and related landscape response. It need comprehensive understanding the formation mechanisms dune with supply material suitable for transport favorable conditions sediment availability wind regimes region. Based on evidences from geomorphological, sedimentological,...

Sedimentation in the dune fields of the Sistan Plain of Iran is the result of deposition of fine-grained sediment downstream of the Helmand River. Due to poor adhesion and low moisture content of soil particles, and the strong renowned Levar wind, dune fields mostly of Barchan and Nebkha types are created. This study aims to assess the physical, morphological and mineralogical characteristics o...