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Record of Grain-size Features of Sand Materials in Tamarix Cone Veins and Theirs Environmental Indication in Lop Nur

Author: SongYan
Tutor: ZhaoYuanJie
School: Hebei Normal
Course: Physical Geography
Keywords: Tamarix Cone Sedimentary laminae Sand substances Granularity Environment Lop Nur
CLC: P931.3
Type: Master's thesis
Year: 2008
Downloads: 110
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Abstract


Lop Nur and its neighboring areas in the eastern Tarim Basin, North kuruktag Mountain, northeast 克孜勒塔格 Mountains and according Gezitage, Hill, East and Gansu critical Baishan adjacent South Altun Mountains, west of the Taklimakan Desert and Desert Kumtag, the eastern A Qike valley and connected to Shule and Hexi Corridor. Lop Nur is the end-result of the Tarim Basin in major rivers, the evolution of the environment is a microcosm of the entire Tarim Basin and the surrounding mountain environment evolution. The winter climate is dry and cold, hot dry summer, and development of a suitable arid area of ??bio-geomorphic types - Hongliu, sandbags. The study found, to clear tamarisk sandbags annual layer structure, and tree rings per year and storage of environmental information can be used to explore and restore hundreds of years of climate and environmental change. Judging by the field survey and satellite imagery, the tamarisk sandbags in the Lop Nur region is mainly distributed in the Tarim River, Kongquehe, Milan River delta. In this paper, Lop Nur region tamarisk sandbags as the main object of study, the use of sand geomorphology, based on fieldwork and observations, combined with sediment particle size experiments test analysis means the initial particle size variation and genetic mechanism of the Lop Nur region . The basic conclusion is as follows: (1) all the Lop Nur region Tamarix Cone of deposited the laminae sand substance machinery are mainly fine sand, silt, clay, followed by, rarely containing coarse sand. The average particle size of the three the tamarisk sandbags sand substances were 3.20Ф, 2.76Ф, 3.40Ф. Sandbags sand layer of the grain size composition, particle size characteristic parameters of the grain size distribution curve, and the particle size of the cumulative probability curve of environmental significance are relatively clear. (2) through a comparative analysis of the different sections of the Lop Nur region tamarisk sandbags granularity data, we can study the changes in the different periods of wind strength and provenance, to obtain the environmental changes over the past century occurred in the Lop Nur region. (3) tamarisk sandbags, desert dunes, coastal dunes granularity contrast analysis can reflect Tamarix Cone has a unique role in the characterization of aeolian landforms, regional environmental change, land cover change, which is the relevant regional environmental change The study provides a new theoretical basis and technical reference. (4) the thickness of the sand layer underlying surface sand source richness. Richer the tamarisk sandbags surrounding sand source, the higher the annual cumulative thickness of the sand layer, combined with relevant meteorological data show that the Lop Nur region more than a century of climate drier to more humid direction. (5) Tamarix Cone different parts of the particle size of the sand material was regularly change, namely the windward slope foot of the slope and coarse granularity in the foot of the slope and slope of the leeward slope, the top of the hill on sediment smallest; Tamarix Cone parts of the grain size, the same wind conditions, and its surrounding material sources. Tamarisk of sandbags top plants can increase the sand the surface roughness, the airflow block energy dissipation, so that the the tamarisk sandbags showing a corresponding particle size characteristics in different parts.

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CLC: > Astronomy,Earth Sciences > Physical Geography > Department of Physical Geography > Geomorphology ( topography ) > Desert geomorphology,dry and geomorphology
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