Sediment redistribution due to a dense reservoir network in a large semi-arid Brazilian basin

Sediment redistribution due to a dense reservoir network in a large semi-arid Brazilian basin
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巴西半干旱盆地密集的水库网络导致沉积物重新分布

DOI:
10.1080/02626667.2011.553616
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发表时间:
2011
影响因子:
3.5
通讯作者:
de Araújo
de Araújo
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Lima Neto;Wiegand;de Araújo

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本文对巴西半干旱盆地(2×104km2)的沉积物分布进行了 25 年的调查,该盆地的网络包含 4000 多个地表水库。该方法基于从现场数据得出的评级曲线和拟合参数。结果表明,悬浮荷载相当于总产沙量(148 t km-2year-1)的70%。悬浮荷载的贡献相对较低(与其他半干旱地区相比)是由于众多上游水库的影响,保留了235 t km-2year-1。微型(<1 hm3)、小型(1-10 hm3)、中型(10-50 hm3)和大型或战略性(>50 hm3)水库分别响应水库网络总沉积物滞留量的5%、17%、30%和48%。这表明非战略水库的滞留对可用水量有积极影响,因为如果仅存在战略水库,战略水库的淤积预计将增加一倍以上。引文Lima Neto, I. E., Wiegand, M.C. & de Araújo, J. C. (2011) 由于巴西半干旱盆地的密集水库网络导致的沉积物重新分布。Hydrol.科学。 J.56(2), 319–333。
This paper investigates for a 25-year period the sediment distribution in a semi-arid Brazilian basin (2 × 104km2) with a network containing more than 4000 surface reservoirs. The methodology is based on rating curves and fitted parameters derived from field data. The results showed that suspended load corresponded to 70% of the total sediment yield (148 t km-2year-1). The relatively low contribution of the suspended load (compared with other semi-arid regions) was attributed to the impact of the numerous upstream reservoirs, which retained 235 t km-2year-1. The micro (<1 hm3), small (1–10 hm3), medium-sized (10–50 hm3), and large or strategic (>50 hm3) reservoirs responded to, respectively, 5, 17, 30 and 48% of the total sediment retention by the reservoir network. This indicates that retention in the non-strategic reservoirs has a positive impact on water availability, since siltation of the strategic reservoirs would be expected to more than double if only such reservoirs existed.CitationLima Neto, I. E., Wiegand, M. C. & de Araújo, J. C. (2011) Sediment redistribution due to a dense reservoir network in a large semi-arid Brazilian basin.Hydrol. Sci. J.56(2), 319–333.
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