| 基于岩性光谱特征的雄安新区地面古河道识别研究 |
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| 关键词:paleochannel lithology remote sensing borehole Xiongan New Area |
| 基金项目:中国地质调查局项目“雄安新区水土质量与工程地质调查评价”(编号: DD20189122) |
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| 摘要: |
| A Study of Paleochannels Interpretation by the Spectrum of Lithology in Xiongan New Area |
| The paleochannels and floodplains in Xiongan New Area are mainly composed of sand and clay, respectively. Mineral composition of the two kinds of lithology shows difference in their spectral reflectance. In this paper, the approaches of field survey and spectral analysis were combined to detect the difference of spectral reflectance of sand and clay. On such a basis, paleochannels were interpreted and were proved by boreholes. According to results obtained, Landsat TM B5 has the largest difference of DN value between sand and clay, so it could be the preferred band to identify channel sand body. Considering the amount and repeatability of spectral information, optimal bands combination for identifying paleochannel is R(4)G(5)B(1); The boreholes show that the surface sand layer is 3.2~8.7 m thick in the interpreted paleochannel area, which fit together with the RS interpretation; On the whole, paleochannels in the study area are well developed in the form of braided river, the density of paleo river system is about 0.26 km/km2, and the width of them ranges from 0.5 to 2.0 km; Borehole profile shows that the terrain of paleochannels is higher than that on both sides, so they could be classified as striped highland paleochannels; There are obvious traces of migration and diversion between rivers. The development of ancient rivers controls the distribution of residential areas. |
| ZHANG Jing,MA Zhen,WU Ai-min,BAI Yao-nan,XIA Yu-bo.2018.A Study of Paleochannels Interpretation by the Spectrum of Lithology in Xiongan New Area[J].Acta Geoscientica Sinica,39(5):542-548. |
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