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Modeling the effects of land cover change on sediment concentrations in a gold-mined Amazonian basin

机译：建模土地覆盖变化对金矿亚马逊盆地沉积物浓度的影响

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摘要

Land use/land cover change (LUCC) combined with gold mining activity (GMA) have reportedly affected the water quality of Amazonian rivers by intensifying surface soil erosion and increasing rivers' sediment concentration (SC). However, the role of LUCC on river siltation in comparison to that caused by GMA has not been assessed, and predictions of SC in the rivers accounting for future LUCC are scarce. This study applied a sediment modeling approach on Crepori Basin, located at eastern Amazon Basin, to simulate the impacts of past and future LUCC on SC in the river, comparing their impacts to those caused by GMA. Between 1973 and 2012, the expansion of deforested areas in the region had increased sheet erosion-driven SC in the river, especially during the high-water season, by up to 73.3%. LUCC projections for 2050 suggest future increases in sheet erosion-driven SC during the high-water season by more than three times of that caused by the land cover scenario of 1998-2012. Comparison between SC driven by sheet erosion to that caused by GMA has also shown that during the high-water and the low-water seasons, respectively, only about 14% and 6% of the total SC in the Crepori River resulted from laminar soil erosion, with the remaining proportion resulting from GMA.
机译：据报道，土地使用/陆地覆盖变化（LUCC）与金矿活动（GMA）通过强化表面土壤侵蚀和增加河流沉积物浓度（SC）影响了亚马逊河流的水质。然而，Lucc对河流淤积的作用与GMA尚未评估，并且在河流核对卢卡河中的SC预测是稀缺的。本研究在位于亚马逊东部盆地的Crepori盆地上应用了沉积物建模方法，模拟了过去和未来Lucc在河流中的影响，比较了他们对由GMA引起的影响的影响。在1973年至2012年间，该地区森林砍伐地区的扩张增加了河流中的薄片侵蚀，特别是在高水季期间，高达73.3％。对于2050年的LUCC预测表明，在高水季期间，在高水季节期间，在1998 - 2012年的土地覆盖情景造成的三次以上，将来增加了纸张侵蚀驱动的SC。由纸张侵蚀到GMA引起的SC之间的比较也表明，在高水和低水季节，分别只有大约14％和6％的克罗佩里河总体SC导致了克罗米尔土壤侵蚀所产生的，剩余比例由GMA产生。

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