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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Effect of ENSO events on sediment production in a large coastal basin in northern Peru
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Effect of ENSO events on sediment production in a large coastal basin in northern Peru

机译：ENSO事件对秘鲁大型沿海盆地泥沙生产的影响

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Although the importance of ENSO on hydrological anomalies has been recognized, variations in sediment fluxes caused by these extreme events are poorly documented. The effect of ENSO is not limited to changes in sediment mobilization. Since ENSO events can affect terrestrial ecosystems, they may have important effects on sediment production and transport in river basins over time spans that are longer than the duration of the event itself. The Catamayo-Chira basin is an interesting casestudy for investigating these geomorphic implications. The objectives were: (i) to study the effect of ENSO on stream flow and sediment yields in the basin, (ii) to investigate if ENSO events affect sediment yields in the post-ENSO period and (iii) to understand which factors control the ENSO and post-ENSO basin response. During strong negative ENSO periods, mean annual stream flow discharge at the inlet of the Poechos reservoir in the lower basin was 5.4 times higher than normal annual discharges, while average sediment fluxes exceeded those of normal years by a factor of about 11. In two heavily affected periods, 45.9% of the total sediment yield in the 29years observation period was generated. Sediment fluxes in the post-ENSO period are lower than expected, which proves post-ENSO event dynamics are significantly different from pre-event dynamics. Our analysis indicates the increase of vegetation growth in the lower basin is not the main reason explaining considerable sediment flux decrease in post-ENSO periods. During strong ENSO events, sediment in alluvial stores in the lower part of the basin is removed due to enlarging and deepening of channels. In post-ENSO periods, normal discharges and persisting sediment supplies from the middle/upper basin lead to river aggradation and storage of large amounts of sediment in alluvial plains. The decrease in sediment export will last for several years until the equilibrium is re-established.
机译：虽然ENSO对水文异常的重要性已经认识到，但这些极端事件引起的沉积物势态的变化记录不佳。 ENSO的效果不限于沉积物动员的变化。由于ENSO事件可能会影响陆地生态系统，因此它们可能对河流盆地的沉积物生产和运输的重要影响，这些跨越时间超过事件本身的持续时间。 CataMayo-Chira盆地是一个有趣的杂志，用于调查这些地貌含义。目的是：（i）研究enso对盆地的流动和沉积物的影响，（ii）调查Enso事件是否影响沉积物产量，以了解哪些因素控制哪个因素控制ENSO和ENSO盆地响应。在强势期间，下盆地的PoeChos储层入口的平均年流流量放电比正常排放量高5.4倍，而平均沉积物势率超过正常年份的沉积物势率约为11.两次大约11倍。受影响的时期，产生29年观察期总沉积物产量的45.9％。后恩松期间的沉积物助条低于预期，从而证明ENSO事件动态与前列前动态显着不同。我们的分析表明较低盆地植被生长的增加不是解释后期后期的相当大沉积物磁通量的主要原因。在强大的ENSO事件期间，由于扩大和深化通道，盆地下部的冲积储存中的沉积物。在ENSO期间，来自中/上盆地的正常排放和持续的沉积物导致河流加重和储存大量沉积物在发生的平原上。沉积物出口的减少将持续数年时间，直到重新建立均衡。

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