An evaluation of an enhanced soil erosion and landscape evolution model: a case study assessment of the former Nabarlek uranium mine, Northern Territory, Australia
An evaluation of an enhanced soil erosion and landscape evolution model: a case study assessment of the former Nabarlek uranium mine, Northern Territory, Australia
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增强土壤侵蚀和景观演化模型的评估：澳大利亚北领地前纳巴莱克铀矿的案例研究评估
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发表时间：
2008
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通讯作者：
K. Evans
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作者：
G. Hancock;J. Lowry;D. Moliere;K. Evans
作为案例研究的采矿后景观评估是评估当前恢复实践的重要组成部分。这一评估的一个必要部分是利用侵蚀和地貌演变建模技术预测地貌的表面稳定性。在短期内，修复后的矿址受到的侵蚀可能导致沉积物负荷增加，并导致下游水道中其他与采矿有关的污染物的迁移。人们普遍认识到，在许多矿区，地表物质的可侵蚀性可能而且确实各不相同。这对矿场而言是一个特别重要的问题，因为矿场的地表条件可能包括未受干扰的天然地表材料区域、用地下挖掘的材料建造的废石堆，以及其他混合废石和土壤以促进植被生长的区域。另一个重要的问题是，当地下材料暴露于表面条件时，它们会迅速风化，改变其可侵蚀性。本文采用一个新版本的西伯利亚景观演变和土壤侵蚀模型，以评估前Nabarlek铀矿遗址在北领地，澳大利亚。这个新版本的西伯利亚使用空间可变的侵蚀和水文参数在整个研究领域代表不同的侵蚀性的表面材料，从而更好地代表流域的异质性。结果表明，该模型预测的侵蚀速率类似于其他模拟结果和独立的现场数据，提供信心的模型及其参数化。堆积在采空坑中并用废石覆盖的尾矿似乎在模拟期间被安全地包裹起来。版权所有© 2008约翰威利父子有限公司和澳大利亚联邦（环境和水资源监督科学家部）。
The assessment of post‐mining landscapes as case studies is an important part of the evaluation of current rehabilitation practices. A necessary part of this assessment is to predict the surface stability of the landform using erosion and landform evolution modelling techniques. In the short term, erosion on a rehabilitated mine site can lead to increased sediment loads and transport of other mine related contaminants in downstream waterways. It is well recognized that in many mine areas the erodibility of surface materials can, and does, vary. This is a particularly significant issue on mine sites, where the surface conditions may range from areas of undisturbed natural surface materials, waste rock dumps constructed with materials exhumed from the sub‐surface, and other areas that have a mix of waste rock and soil to enhance the growth of vegetation. A further significant issue is that when the subsurface materials are exposed to surface conditions they can weather rapidly, changing their erodibility. This paper uses a new version of the SIBERIA landscape evolution and soil erosion model to evaluate the former Nabarlek uranium mine site in the Northern Territory, Australia. This new version of SIBERIA uses spatially variable erosion and hydrology parameters across the study domain to represent different erodibilities of surface materials, thus allowing better representation of catchment heterogeneity. The results demonstrate that the model predicts erosion rates similar to that of other modelled results and independent field data, providing confidence in the model and its parameterization. The tailings, deposited in the mined out pit and capped with waste rock, appear to be safely encapsulated for the modelled period. Copyright © 2008 John Wiley & Sons, Ltd and Commonwealth of Australia (Department of the Environment and Water Resources Supervising Scientist).