Response of river-dominated delta channel networks to permanent changes in river discharge
Response of river-dominated delta channel networks to permanent changes in river discharge
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DOI：
10.1029/2010gl043269
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发表时间：
2010-06-23
影响因子：
5.2
通讯作者：
Smith, Norm
中科院分区：
文献类型：
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作者：
Edmonds, Doug;Slingerland, Rudy;Smith, Norm
利用数值实验，我们研究如何河流为主的三角洲河道网络可能会对河流流量的变化，预计发生在下一个世纪的环境变化的结果。我们的研究结果表明，流量的变化高达初始值的60%，减少的结果在三角洲分流放弃，而增加并没有显着影响网络。然而，流量增加超过60%的阈值，导致河道的形成和分流网络密度的增加。这种行为是预测的一个单独的分叉臂不对称的水面坡度的分析。鉴于在大多数河流流域的流量将在未来世纪的变化不到50%，我们的研究结果表明，在干旱增加的地区的三角洲将更有可能经历显着的三角洲通道网络的重新安排。引文：Edmonds，D.，R. Slingerland，J. Best，D. Parsons和N. Smith（2010），河流主导三角洲河道网络对河流流量永久变化的响应，Geophys。
Using numerical experiments, we investigate how river-dominated delta channel networks are likely to respond to changes in river discharge predicted to occur over the next century as a result of environmental change. Our results show for a change in discharge up to 60% of the initial value, a decrease results in distributary abandonment in the delta, whereas an increase does not significantly affect the network. However, an increase in discharge beyond a threshold of 60% results in channel creation and an increase in the density of the distributary network. This behavior is predicted by an analysis of an individual bifurcation subject to asymmetric water surface slopes in the bifurcate arms. Given that discharge in most river basins will change by less than 50% in the next century, our results suggest that deltas in areas of increased drought will be more likely to experience significant rearrangement of the delta channel network. Citation: Edmonds, D., R. Slingerland, J. Best, D. Parsons, and N. Smith (2010), Response of river dominated delta channel networks to permanent changes in river discharge, Geophys.