High Resolution Remote Sensing Estimation of Salinity in Salt Lake with Uranium Resources
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摘要: 盐湖湖水矿化度高低与其含铀量呈明显的正相关性, 因此, 盐湖矿化度可作为评价盐湖水含铀度的间接标志.为解决盐湖不同水域矿化度快速、精细识别, 以柴达木盆地尕斯库勒含铀盐湖为例, 基于高分辨率SPOT5卫星数据开展了盐湖水体矿化度遥感估测.对盐湖不同矿化度卤水进行光谱测试, 总结了不同矿化度卤水在可见-红外谱段的光谱识别特征, 基于该特征构建了SPOT5数据的多维矿化度估测指数, 运用比值+主成分分析法估测了湖水的矿化度信息, 发现了盐湖东部水域高矿化度环形异常现象, 找出了隐藏在湖水水域的矿化度变异部位, 为含铀盐湖富矿水域的快速定位提供了重要依据.Abstract: The uranium resources of salt lake is positively correlated to the salinity, and the salinity of salt lake is an important factor to evaluate whether it contains rich uranium resources. This paper takes the Gasikule salt lake with uranium resources in Qaidam as the study area, exploring the remote sensing estimation of salinity based on SPOT5 data with high resolution, in order to to identify the salinity fast and precisely. The spectrum of lake water with different salinity are acquired and the spectra feature is studied, and the multi-dimensional salinity indexes of SPOT5 data are constructed. What's more, the paper extracted the salinity information of salt lake by the method of ratio and principal components analysis (PCA), and discovered the high salinity circular abnormal phenomenon in the east of lake, and identified the location of salinity abnormal hiding in the salt lake. The results provide the important basis to identify the location of rich uranium resources in salt lake.
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Key words:
- salt lake with Uranium resources /
- salinity /
- high resolution remote sensing /
- estimation
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图 1 尕斯库勒钾盐盐田不同矿化度卤水室内光谱测量曲线
1.补给淡水；2.盐湖水(280 g/L)；3.晶洞卤水(345 g/L)；4.钠盐池卤水(338 g/L)；5.泄利盐池卤水(366 g/L)；6.钾盐矿池卤水(442 g/L)；7.老卤池卤水(426.57 g/L)
Fig. 1. Spectral curves of brine with different salinity in Gasikule potash fields
图 2 尕斯库勒盐湖区SPOT5数据波段321组合遥感影像
Fig. 2. SPOT5 image composed by Band321of Gasikule salt lake
图 4 SPOT5影像盐湖取样点位波谱曲线
1~9为图 3中1~9号点SPOT影像的光谱曲线；横坐标为SPOT5数据第几波段，纵坐标为反射辐亮度值
Fig. 4. Spectral curves of selection points on SPOT5 image
图 7 2010年实测尕斯库勒盐湖水深等值线
据郝伟林和林校斌，2010年.盐湖铀资源形成条件和分布规律.北京：核工业北京地质研究院
Fig. 7. Water depth contour sketch of Gasikule salt lake measured in 2010
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