Abstract The Badas peat dome located in the Belait district is one of the biggest peat domes in Brunei. Over the years, this area has seen a noticeable loss of peatland due to fires and infrastructure development. In this paper, the anthropogenic effects on the Badas peat dome were studied for three survey areas using seismic refraction surveys, core analysis and single well tests. Satellite images were used to confirm the extent of past peat fires in the area. Using these methods, this study has identified multiple peat, sand and clay layers demonstrating the stratigraphic heterogeneity that can be present in tropical peatlands. In particular, a sand horizon underlying the peat deposits was identified which has the potential to be a significant hydrogeological flow unit. Groundwater level interpretations from 2D velocity data were correlated to groundwater levels from coring. In order to determine the degradation impact on peat through lowering of groundwater levels using these methods we produced a subsurface reconstruction at two locations with different levels of peat degradation. Single well tests conducted in this study showed that disturbed peat had lower hydraulic conductivities with an average of 1.73 × 10−5 m/s compared to undisturbed peat with an average of 6.66 × 10−5 m/s. A combination of these methods (seismic refraction, single well test and coring) are suitable for identifying different levels of peat degradation. In addition, these methods can be suitable for profiling in tropical peatlands, for identifying groundwater levels as wells as identifying significant hydrogeological flow units.

中文翻译：

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文莱达鲁萨兰国 Badas Peat Dome 人为降解泥炭的地震折射研究、单井测试和物理岩心分析

摘要 位于勿莱区的巴达斯泥炭穹顶是文莱最大的泥炭穹顶之一。多年来，由于火灾和基础设施的发展，该地区的泥炭地明显减少。本文通过地震折射调查、岩心分析和单井试验，研究了三个调查区对巴达斯泥炭丘的人为影响。卫星图像被用来确认该地区过去泥炭火灾的程度。使用这些方法，本研究确定了多个泥炭、沙子和粘土层，证明了热带泥炭地中可能存在的地层异质性。特别是，确定了泥炭沉积下面的沙层，它有可能成为重要的水文地质流动单元。二维速度数据的地下水位解释与取心的地下水位相关。为了通过使用这些方法降低地下水位来确定对泥炭的退化影响，我们在泥炭退化程度不同的两个地点进行了地下重建。本研究中进行的单井测试表明，与未受干扰的泥炭平均 6.66 × 10−5 m/s 相比，受干扰的泥炭具有较低的水力传导率，平均为 1.73 × 10−5 m/s。这些方法（地震折射、单井测试和取芯）的组合适用于识别不同程度的泥炭降解。此外，这些方法可适用于热带泥炭地的剖面分析，用于识别地下水位以及识别重要的水文地质流动单元。