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首页> 外文OA文献 >Towards an increase of flash flood geomorphic effects due to gravel mining and ground subsidence in Nogalte stream (Murcia, SE Spain)
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Towards an increase of flash flood geomorphic effects due to gravel mining and ground subsidence in Nogalte stream (Murcia, SE Spain)

机译：由于Nogalte溪流中的砾石开采和地面沉降，导致山洪暴发地貌效应增加（西班牙穆尔西亚）

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Transition from endorheic alluvial fan environments to well-channelized fluvial systems in natural conditions may occur in response to base-level fluctuations. However, human-induced changes in semi-arid regions can also be responsible for similar unforeseen modifications. Our results confirm that in-channel gravel mining and aquifer overexploitation over the last 50 years in the case study area have changed the natural stability of the Nogalte stream and, as a result, its geomorphic parameters including channel depth and longitudinal profile have begun to adapt to the new situation. Using interferometric synthetic aperture radar (InSAR) data we obtain maximum values for ground subsidence in the Upper Guadalentín Basin of  ∼ 10 cm yr−1 for the period 2003–2010. In this context of a lowered base level, the river is changing its natural flood model to a more powerful one. A comparison of the 1973 flood event, the most dramatic flood event ever recorded in the area, with the 2012 event, where there was a similar discharge but a sediment load deficit, reveals greater changes and a new flooding pattern and extension. In-channel gravel mining may be responsible for significant local changes in channel incision and profile. This, together with the collateral effects of aquifer overexploitation, can favour increased river velocity and stream power, which intensify the consequences of the flooding. The results obtained here clearly demonstrate an existing transition from the former alluvial pattern to a confined fluvial trend, which may become more pronounced in the future due to the time lag between the drop in aquifer level and ground subsidence, and introduce a new scenario to be taken into consideration in future natural hazard planning in this area.
机译：在自然条件下，可能会发生从胶溶冲积扇环境到渠道良好的河流系统的转变，以响应基础水平的波动。但是，人类在半干旱地区引起的变化也可能导致类似的意外变化。我们的研究结果证实，案例研究区过去50年的河道内砾石开采和含水层过度开采改​​变了Nogalte溪流的自然稳定性，因此，其地貌参数（包括河道深度和纵向剖面）已开始适应适应新形势。利用干涉合成孔径雷达（InSAR）数据，我们获得了2003-2010年期间瓜达伦丁上流Basin〜10 cm yr-1地面沉降的最大值。在基准水位降低的背景下，这条河正在将其自然洪水模型改变为一种更强大的模型。 1973年的洪灾事件是该地区有史以来最剧烈的洪灾事件，与2012年的洪灾相类似，泄洪量相似，但泥沙负荷不足，这显示出更大的变化以及新的洪灾模式和范围。河道内的砾石开采可能是造成河道切口和剖面局部显着变化的原因。这与含水层过度开采的附带影响一起，可能有助于增加河流速度和河流功率，从而加剧洪水的后果。此处获得的结果清楚地表明了从以前的冲积模式到有限的河流趋势的现有过渡，由于含水层水位下降和地面沉降之间的时间差，这种趋势将来可能变得更加明显，并提出了一种新的预测方案。在该地区未来的自然灾害规划中已考虑在内。

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