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Jiongxin Xu - One of the best experts on this subject based on the ideXlab platform.

  • The behavior of specific sediment yield in different grain size fractions in the tributaries of the middle Yellow River as influenced by Eolian and fluvial Processes
    Earth Surface Processes and Landforms, 2008
    Co-Authors: Jiongxin Xu
    Abstract:

    Based on data from 35 stations on the tributaries of the Yellow River, annual specific sediment yield (Y s ) in eight grain size fractions has been related to basin-averaged annual sand-dust storm days (D ss ) and annual precipitation (P m ) to reveal the influence of Eolian and fluvial Processes on specific sediment yield in different grain size fractions. The results show that Y s in fine grain size fractions has the highest values in the areas dominated by the coupled wind-water Process. From these areas to those dominated by the Eolian Process or to those dominated by the fluvial Process, Y s tends to decrease. For relatively coarse grain size fractions, Y s has monotonic variation, i.e. with the increase in D ss or the decrease in P m , Y s increases. This indicates that the sediment producing behavior for fine sediments is different from that for relatively coarse sediments. The results all show that Y s for relatively coarse sediments depends on the Eolian Process more than on the fluvial Process, and the coarser the sediment fractions the stronger the dependence of the Y s on the Eolian Process. The Y s -D ss and Y s -P m curves for fine grain size fractions show some peaks and the fitted straight lines for Y - D ss and Y s -P m relationships for relatively coarse grain size fractions show some breaks. Almost all these break points may be regarded as thresholds. These thresholds are all located in the areas dominated by the coupled wind-water Process, indicating that these areas are sensitive for erosion and sediment production, to which more attention should be given for the purpose of erosion and sediment control. A number of regression equations were established, based which the effect of rainfall, sand-dust storms and surface material grain size on specific sediment yield can be assessed. Copyright © 2007 John Wiley & Sons, Ltd.

U.s. Geological Survey - One of the best experts on this subject based on the ideXlab platform.

  • Eolian transportation
    U.S. Geological Survey, 2016
    Co-Authors: U.s. Geological Survey
    Abstract:

    Ensino Fundamental Inicial::Meio AmbienteThe image shows the saltation, an Eolian Process which is responsible for moving 95% of the grains. In this type of transport the particles of sand move towards the wind through small jumps or skip

  • Eolian transportation
    U.S. Geological Survey, 2011
    Co-Authors: U.s. Geological Survey
    Abstract:

    The image shows the saltation, an Eolian Process which is responsible for moving 95% of the grains. In this type of transport the particles of sand move towards the wind through small jumps or skipsEnsino Fundamental Inicial::Meio Ambient

Rob A Kemp - One of the best experts on this subject based on the ideXlab platform.

  • changes in mineralogy of loess paleosol sections across the chinese loess plateau
    Quaternary Research, 2011
    Co-Authors: Gi Young Jeong, Stephen Hillier, Rob A Kemp
    Abstract:

    Quantitative mineralogical analysis of bulk samples and single particles was carried out on three loess sections of different local climate settings on the Chinese Loess Plateau (CLP). Mineralogy, geochemistry, and single-particle petrography of loess and paleosols are relatively uniform over the CLP. However, in detail, there are mineralogical changes related to Eolian Process and chemical weathering. Particle-size sorting eastward from western sources led to an eastward increase of the total phyllosilicate contents enriched in fine illitic clay minerals. After deposition, detrital minerals susceptible to chemical weathering were sequentially altered in a progressive fashion with increasing precipitation in the order of calcite, dolomite, biotite, illite, chlorite, amphibole, and plagioclase. The weathering of biotite, chlorite, and illite resulted in a significant increase of expandable phyllosilicate contents. The sequential weathering of the minerals is reflected chemically in the decrease of Na and Mg and the increase of iron oxidation. Mineralogy of the Chinese loess at individual sites reflects the effects of size fractionation during Eolian transportation and progressive sequential weathering along the climatic gradient, and it is essential to consider both effects when using mineralogical and dependent chemical data in the paleoclimatic reconstruction of the CLP.

Gi Young Jeong - One of the best experts on this subject based on the ideXlab platform.

  • changes in mineralogy of loess paleosol sections across the chinese loess plateau
    Quaternary Research, 2011
    Co-Authors: Gi Young Jeong, Stephen Hillier, Rob A Kemp
    Abstract:

    Quantitative mineralogical analysis of bulk samples and single particles was carried out on three loess sections of different local climate settings on the Chinese Loess Plateau (CLP). Mineralogy, geochemistry, and single-particle petrography of loess and paleosols are relatively uniform over the CLP. However, in detail, there are mineralogical changes related to Eolian Process and chemical weathering. Particle-size sorting eastward from western sources led to an eastward increase of the total phyllosilicate contents enriched in fine illitic clay minerals. After deposition, detrital minerals susceptible to chemical weathering were sequentially altered in a progressive fashion with increasing precipitation in the order of calcite, dolomite, biotite, illite, chlorite, amphibole, and plagioclase. The weathering of biotite, chlorite, and illite resulted in a significant increase of expandable phyllosilicate contents. The sequential weathering of the minerals is reflected chemically in the decrease of Na and Mg and the increase of iron oxidation. Mineralogy of the Chinese loess at individual sites reflects the effects of size fractionation during Eolian transportation and progressive sequential weathering along the climatic gradient, and it is essential to consider both effects when using mineralogical and dependent chemical data in the paleoclimatic reconstruction of the CLP.

Stephen Hillier - One of the best experts on this subject based on the ideXlab platform.

  • changes in mineralogy of loess paleosol sections across the chinese loess plateau
    Quaternary Research, 2011
    Co-Authors: Gi Young Jeong, Stephen Hillier, Rob A Kemp
    Abstract:

    Quantitative mineralogical analysis of bulk samples and single particles was carried out on three loess sections of different local climate settings on the Chinese Loess Plateau (CLP). Mineralogy, geochemistry, and single-particle petrography of loess and paleosols are relatively uniform over the CLP. However, in detail, there are mineralogical changes related to Eolian Process and chemical weathering. Particle-size sorting eastward from western sources led to an eastward increase of the total phyllosilicate contents enriched in fine illitic clay minerals. After deposition, detrital minerals susceptible to chemical weathering were sequentially altered in a progressive fashion with increasing precipitation in the order of calcite, dolomite, biotite, illite, chlorite, amphibole, and plagioclase. The weathering of biotite, chlorite, and illite resulted in a significant increase of expandable phyllosilicate contents. The sequential weathering of the minerals is reflected chemically in the decrease of Na and Mg and the increase of iron oxidation. Mineralogy of the Chinese loess at individual sites reflects the effects of size fractionation during Eolian transportation and progressive sequential weathering along the climatic gradient, and it is essential to consider both effects when using mineralogical and dependent chemical data in the paleoclimatic reconstruction of the CLP.