沙化土地遥感监测研究现状 - 仁和软件
2007年4月18日 · Remote sensing monitoring of sandification is a key technique to collect the status and dynamics of sandy land, providing scientific bases for the national sandification control. The paper introduces information sources, spectral characteristics, sandification information extraction, sandification classification and dynamic analyses, summarizes ...
Sandification vs. muddification of tidal flats by benthic …
2019年11月15日 · If sediment is muddy, benthos can gradually decrease the silt content of the sediment by specifically resuspending the fine fraction, leading to a sandification of the sediment. In our experiment, we observed this sandification in …
Sandification degree classification of sandy dolomite base on ...
2024年8月9日 · Sandification can degrade the strength and quality of dolomite, and to a certain extent, compromise the stability of a tunnel's surrounding rock as an unfavorable geological...
沙化 - 百度百科
沙化就是地表出现风沙活动，土地生产力下降，土地退化的过程。 在《中国荒漠化报告》中直接使用了沙化这个概念。 [2] 2023年3月5日，国务院总理李克强在政府工作报告中指出，五年来，沙化土地面积净减少3.3万平方公里。 [3] 2023年3月，全国绿化委员会办公室发布《2022年中国国土绿化状况公报》 (简称《公报》)。 《公报》显示：2022年完成治理沙化、石漠化土地184.73万公顷。 [4] 2024年1月22日，全国林业和草原工作视频会议显示，2023年中国治理沙化石漠化土 …
Sandification degree classification of sandy dolomite base on ...
2024年8月9日 · Dolomite sandification is a unique geological phenomenon in which dolomite, under the influence of a complex geological environment of multistage tectonic movement, is weathered into silty fine sand, gravel, and/or fragment under the combined action of karstification and weathering.
Characteristics of Sandification Dolomite and Effect on In
A group of Carboniferous and Permian dolomites are widely developed in the Tianxingzhou belt of carbonate rock in Wuhan. Drilling revealed that the dolomite has different degrees of sandification, which has caused many difficulties to the exploration, design and...
第六次全国荒漠化和沙化调查主要结果及分析
第六次全国荒漠化和沙化调查以第三次全国国土调查成果为底板,以2019年为基准年,全面查清了我国荒漠化和沙化的状况。 通过简要介绍第六次全国荒漠化和沙化调查的基本情况,全国荒漠化和沙化土地状况和动态变化,结合相关资料分析了目前的防治形势并提出了对策建议。 调查结果显示,截至2019年,我国荒漠化土地面积为25 737.13万hm 2,沙化土地面积为16 878.23万hm 2。 与2014年相比,5年间全国荒漠化土地面积净减少378.80万hm 2,年均减少75.76万hm 2。 沙化土地面积 …
dolomite sandification will lead to worse stability of the tunnel face. Jiang et al. (2022) found that the characteristics of sandy dolomite and groundwater seepage are the key factors for water and sand inrush on the tunnel face in water-rich sandy dolomite stratum and proposed that precipitation is a necessary measure
Spatio-temporal patterns and dynamics of sensitivity to sandification …
2024年1月23日 · Sandification is one of the leading environmental problems challenging the ecological integrity of the global drylands and a major barrier to meeting basic human needs in drylands (Mazhar & Shirazi, 2023). A phenomenon of land deterioration known as "desertification" turns rich land into an arid desert (Abdel Rahman, 2023).
Evolution mechanism of tunnel water and sand inrush considering …
2023年11月1日 · Water-rich sandy dolomite stratum is prone to water and sand inrush disasters during tunnel construction. It is of great significance to explore its hazard-causing structure and water inrush mechanism for disaster control.