舟曲泥石流源区土壤分散性高光谱探测模型

发布时间：2018-09-03 15:52

【摘要】：通过开展土壤分散性高光谱测量实验,首次明确了舟曲泥石流源区土壤分散性敏感波段位置、建立了土壤分散性高光谱探测模型、探讨了土壤分散性高光谱探测机理。结果表明,(1)傅里叶变换可以将光谱从时间域转换为频率域,实现对光谱信号与噪声的分离。通过开发矿物组分精细鉴别系统,实现了光谱去噪,为构建土壤分散性高光谱探测模型提供了高保真数据源;(2)基于多元线性回归分析法建立的土壤分散性高光谱探测模型在研究区具有较好的预测能力,所确定的敏感波段位置及其反射率与土壤分散性具有较高的相关性;(3)分析矿物光谱结果表明,土壤分散性高光谱探测的敏感波段位置实际上反映了土壤矿物组分及其所吸附的离子类型,揭示了导致土壤分散的深层原因:与舟曲泥石流源区土壤分散性关系最为密切的是钠离子,其次是方解石、蒙脱石和伊利石,与绿泥石、高岭石、pH值、石英、钾长石、斜长石等的相关性较弱。其原因主要是与钠离子所具有的离子价低、半径小、水化力强的特点,方解石所具有的水溶性特点,蒙脱石所具有的层间结合力极弱、易吸附钠离子的特点,伊利石在高PH值条件下所具有的强吸附阳离子、高土壤分散性的特性有关。
[Abstract]:Through the experiment of soil dispersion hyperspectral measurement, the sensitive band position of soil dispersion in the source region of Zhouqu debris flow was determined for the first time, and the model of soil dispersion hyperspectral detection was established, and the mechanism of soil dispersion hyperspectral detection was discussed. The results show that: (1) Fourier transform can transform spectrum from time domain to frequency domain and separate spectral signal from noise. By developing a fine identification system for mineral components, spectral denoising is realized. It provides a high fidelity data source for the construction of soil dispersion hyperspectral detection model. (2) the soil dispersion hyperspectral detection model based on multiple linear regression analysis has good prediction ability in the study area. The sensitive band position and reflectivity are highly correlated with soil dispersion. (3) the results of mineral spectral analysis show that, The sensitive band position of soil dispersion hyperspectral detection actually reflects the composition of soil minerals and the type of ions they adsorb. The deep causes of soil dispersion are revealed as follows: sodium ion is the most closely related to soil dispersion in Zhouqu debris flow source region, followed by calcite, montmorillonite and Illite, and chlorite, kaolinite pH value, quartz, potassium feldspar. The correlation of plagioclase is weak. The main reasons are the characteristics of low ionic value, small radius, strong hydration force, water-soluble characteristics of calcite, extremely weak interlaminar adhesion of montmorillonite, and easy adsorption of sodium ions with montmorillonite. Illite has the characteristics of strong adsorption of cation and high dispersion of soil under high PH value.
【作者单位】：中国科学院遥感与数字地球研究所数字地球重点实验室;三亚中科遥感研究所海南省地球观测重点实验室;山东科技大学;
【基金】：国家自然科学基金项目(41171280) 中国科学院“西部之光人才培养计划”(Y32301101B) 三亚市院地合作项目(sy14ys01132)资助
【分类号】：P642.23

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