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- W814955837 abstract "Successful performance of soil cover systems depends on both physical properties (including water retention characteristics, depth, and number and arrangement of materials), which define the soil cover design, and climatic conditions. While the physical properties can be addressed by sitespecific selection or completion criteria and through technical means, climatic conditions are out of anthropogenic control. Climate parameters are commonly used in the first instance to plan the cover design. However, for some climates commonly used climate indices such as the rainfall to evaporation ratio or annual means of meteorological parameters oversimplify the complexity of variable and partly erratic rainfall patterns. In this paper we present a climate-based planning framework for soil cover systems that explicitly considers climate variability. We demonstrate our approach based on a case study using historical rainfall and evaporation data from semi-arid Mount Isa (Queensland, Australia), where highly variable rainfall events are driven by monsoonal weather situations or intense convective storms. We use Hydrus-1D to simulate the seepage from two contrasting soil materials – a unimodal silt and a bimodal waste rock material. We run the model with a number of generated climate data based on the historical climate observations, and compare the seepage patterns for the two selected soil materials with uniform distributions of rainfall and evaporation. As hypothesised, maximum seepage events and number of large seepage events were several orders of magnitude higher for the waste rock material. Interestingly, under some climatic conditions (mainly determined by its variability) the average seepage was higher for silt material. In any case, climate variability had a great impact on the seepage patterns; i.e., the median seepage, the maximum seepage events. The number of large seepage events was several orders of magnitude higher when including the variability of events compared with the control model, where rainfall and evaporation distributions were uniform. This indicates the critical role climate variability plays for the performance of soil cover systems, and the need to implement a similar approach into postmining planning schemes." @default.
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- W814955837 date "2015-01-01" @default.
- W814955837 modified "2023-09-27" @default.
- W814955837 title "Integration of climate analysis into a framework for cover design" @default.
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