浅地层剖面探测技术在山地型水库生态研究中的应用
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摘要
山地型水库盆底地形复杂,沉积物分布空间差异大,对获取水库完整的沉积记录带来挑战。我们首次利用浅地层剖面仪,探测广东省大型供水水库水底地形和沉积记录,结果证实水库库底地形复杂多变,局部可见水下滑坡和泥沙淤积;沉积厚度由几厘米至上百厘米不等,部分区域可见明显层状结构,分辨率可达10 cm,是采取柱样的理想位置,并得到实地所采柱样剖面的证实。这说明浅地层剖面探测技术适用于研究山地型水库沉积物分布,是进行水库长期生态学野外采样的必要手段。
The complex basin topography of mountain reservoirs always brings challenge to core expanded,continuous,highly representative cores for paleoecological studies.Using a RS-QP0116 sub-bottom profiler,we tested and applied the shallow-strata profiling technology to 8 track lines in the Liuxihe Reservoir.Our results show that the reservoir bottom topography varies greatly with evidence of local underwater landslides and sediment accumulation,and that sediment thickness changes spatially from a few to more than a hundred centimeters.More importantly,ideal coring sites can be determined at where clear sediment layering of up to 10 cm in vertical resolution is seen,which was further confirmed by on-site coring.This demonstrates the shallow-strata profiler is suitable for sediment survey in mountain reservoirs,and is a necessary tool for determining sediment-coring sites in paleoecological research.
引文
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