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Do badlands (always) control sediment yield? Evidence from a small intermittent catchment
Catena ( IF 6.2 ) Pub Date : 2020-11-13 , DOI: 10.1016/j.catena.2020.105015
M. Llena , R.J. Batalla , MW. Smith , D. Vericat

The objective of this paper is to analyse the production and the yield of fine sediment in a small mountain catchment (10 km2), characterised by patches of badlands (25% of the catchment area) and drained by intermittent streams. The study area is located in the Southern Central Pyrenees. The study is performed at multiple temporal scales to further highlight: (i) the effect of pulses in the transfer of water and fine sediment; (ii) the contribution of the sediment production from badlands to the sediment yield of the catchment; and (iii) the role of the drainage network as fine sediment source and sink. Significant correlations between meteorological and flow variables were found; specifically, the strongest positive relations were observed between stream flashiness, the duration of the period in which the stream is dry and the suspended sediment concentration. Results indicated that badlands do not always control the export of sediments. At the annual scale badlands supply around 40% of the total catchment sediment yield. Seasonally sediment produced in badlands can be higher than the amount exported at the catchment outlet, suggesting the channel network acts as a sink. In terms of sediment production, badlands represent around of 53% of the total production taking also into account agricultural fields and forest areas. Results emphasise the key role of the channel network on controlling pulses of sediment transfer, in direct relation to the intermittent character of the streams. The frequency and magnitude of such pulses determines the catchment Sediment Delivery Ratio (SDR), depending on whether the drainage network acts as a sediment sink or source.



中文翻译:

荒地(总是)会控制沉积物产量吗?间歇性小流域的证据

本文的目的是分析一个小的山区流域(10 km 2),其特征是一片荒地(流域面积的25%),并被间歇性的溪流排干。研究区域位于比利牛斯山脉中南部。这项研究在多个时间尺度上进行,以进一步突出:(i)脉冲在水和细沉积物转移中的作用;(ii)荒地产生的沉积物对流域的沉积物产量的贡献;(iii)排水网络作为精细沉积物源和汇的作用。发现了气象和流量变量之间的显着相关性;具体而言,在水流闪动,水流干燥期间的持续时间和悬浮的泥沙浓度之间观察到最强的正相关关系。结果表明,荒地并不总是能控制沉积物的出口。在每年的规模上,荒地的供应量约为流域沉积物总产量的40%。在荒地中产生的季节性沉积物可能高于流域出口处的出口量,这表明河道网络是一个汇。在沉积物产量方面,考虑到农田和林地,荒地约占总产量的53%。结果强调了河道网络在控制沉积物传输脉冲中的关键作用,与河流的间歇特性直接相关。此类脉冲的频率和大小决定了集水区的泥沙输送比(SDR),具体取决于排水网络是充当沉积物汇还是源。在荒地中产生的季节性沉积物可能高于流域出口处的出口量,这表明河道网络是一个汇。在沉积物产量方面,考虑到农田和林地,荒地约占总产量的53%。结果强调了河道网络在控制沉积物传输脉冲中的关键作用,与河流的间歇特性直接相关。此类脉冲的频率和大小决定了集水区的泥沙输送比(SDR),具体取决于排水网络是充当沉积物汇还是源。在荒地中产生的季节性沉积物可能高于流域出口处的出口量,这表明河道网络是一个汇。在沉积物产量方面,考虑到农田和林地,荒地约占总产量的53%。结果强调了河道网络在控制沉积物传输脉冲中的关键作用,与河流的间歇特性直接相关。此类脉冲的频率和大小决定了集水区的泥沙输送比(SDR),具体取决于排水网络是充当沉积物汇还是源。考虑到农田和林地,荒地约占总产量的53%。结果强调了河道网络在控制沉积物传输脉冲中的关键作用,与河流的间歇特性直接相关。此类脉冲的频率和大小决定了集水区的泥沙输送比(SDR),具体取决于排水网络是充当沉积物汇还是源。考虑到农田和林地,荒地约占总产量的53%。结果强调了河道网络在控制沉积物传输脉冲中的关键作用,与河流的间歇特性直接相关。此类脉冲的频率和大小决定了集水区的泥沙输送比(SDR),具体取决于排水网络是充当沉积物汇还是源。

更新日期:2020-11-13
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