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首页> 外文期刊>Advances in limnology >Driving forces for solute transport in the hyporheic zone of the River Lahn (Germany): numerical simulations
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Driving forces for solute transport in the hyporheic zone of the River Lahn (Germany): numerical simulations

机译：拉恩河（德国）水溶带中溶质运移的驱动力：数值模拟

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摘要

Hydraulic exchange processes between the surface water and the hyporheic zone play an important role for the hyporheic fauna, since they supply the habitat with nutrients and oxygen. The dynamic hydraulic exchange processes were inspected in situ along a riffle-pool sequence at the River Lahn, Germany. Hydraulic heads and tracer concentrations were reproduced with numerical models in order to simulate the solute transport in the hyporheic zone. As transport mechanisms act on different scales, the influence of the groundwater aquifer, the morphological structure of the riffle and the small-scale exchange due to local irregularities were differentiated. The small-scale exchange was described cumulatively by a so-called exchange coefficient, which is based on a diffusion concept. Results show that the hyporheic flow is controlled by the riffle morphology and the groundwater table. An increased groundwater table due to the enlargement of a pond had a strong impact on the hyporheic habitat. Small-scale exchange is the driving force for the solute exchange of the upper decimeter of the sediment. As most biogeochemical processes occur here, the small-scale exchange is important for the metabolism of the hyporheic zone and the surface water.
机译：地表水和水流带之间的水力交换过程对水流动物群起着重要作用，因为它们为生境提供了养分和氧气。动态液压交换过程在德国拉恩河沿浅滩顺序现场检查。用数值模型再现了水头和示踪剂的浓度，以模拟溶质在流变带中的运移。由于运输机制作用于不同的尺度，因此区分了地下水含水层，浅滩的形态结构和局部不规则引起的小规模交换的影响。小规模交换是通过基于扩散概念的所谓交换系数来累积描述的。结果表明，低渗流受浅滩形态和地下水位控制。由于池塘的扩大，地下水位增加对水流环境产生了很大的影响。小规模交换是沉积物上分米的溶质交换的驱动力。由于大多数生物地球化学过程都在这里发生，因此小规模的交换对于流变带和地表水的代谢非常重要。

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