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Formation of sand dune at Ao Bang Berd, Tambon Pakkhlong, Amphoe Pathio, Changwat ChumphonWeeraya Lertnok
This chapter defines and describes the global distribution of sand seas and large dunefields. Factors controlling their distribution and size are discussed, including climate, topography, the distribution of large sand sources, and regional-scale sand transport pathways. The response of sand seas and ...
Paradoxically, finer grains of silt and clay (< 0.050mm) are cohesive and can resist wind erosion. This property of sand is reflected in the wind threshold speed curve for sand transport (Fig. 17.1) explaining why dune sand, in most cases, is composed of fine particles between 0.125鈥 ...
Sand, freed from the bluff by sublimation of ice, is transported into the dune field sometimes with snow sometimes without, depending on weather conditions. Groundfrost increases with distance upslope, reaching a depth of several m at the crestslope. Frost depth is controlled by the rate of ...
a 'V' shaped pattern was presented in the active dune system, and a reverse 'V' shaped pattern in the stabilized sand dune system; (3) vertically, the proportion (accounting for the total seeds) of seeds found in 0–20 mm soil profile decreased from stabilized sand dune to interdune ...
It proves that the dunes are reformed by the aeolian action from the coastal bars.The barrier and coastal dune play an important role in protecting the bank. Between them and the delta plain there are silt or silt-sand lagoons. The Qilihai (lake) is the most typical of them. The ...
Quantitatively determining the provenance of dune sand is one of the problems necessarily and urgently to be solved in geomorphic and desertification research. 分析结果表明:呼伦贝尔沙地的风成沙丘砂主要来源于海拉尔组砂(Q3),但河流冲积砂和古土壤也有不可忽视的作用;在嵯岗镇附近及其以西的海拉尔河下游宽阔...
An experiment was conducted in early March 2003 on 0.5, 1 and 1.5 m 2 straw checkerboard plots on the windward slope and leeward slope of a sand dune on the southeastern edge of Tengger desert, China, to study the mechanism of formation of physical soil crust in desert soils. The samples...
The only physical variable of relevance is the dune height, from which the dune width and velocity are determined, as well as phenomenological rules for interaction between two dunes of different heights. We find that dune fields with no sand on the ground between dunes are unstable, i.e., ...