“Untangling Hyporheic Residence time Distributions and Whole Stream” “Metabolism Using a Hydrological Process Model”
“Untangling Hyporheic Residence time Distributions and Whole Stream” “Metabolism Using a Hydrological Process Model”
复制标题
“解开水流停留时间分布和整个河流” “使用水文过程模型的代谢”
DOI：
10.1016/j.proeng.2016.07.598
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Molkenthin
中科院分区：
文献类型：
--
作者：
Altenkirch;Zlatanovic;Woodward;Trauth;Molkenthin
在潜流沉积物中，水停留时间与沉积物代谢速率的相互作用被认为是控制整个河流代谢的关键因素。然而，由于方法上的困难，很少有数据，调查这一基本理论的水生生态学。在这里，我们报告取得的进展，联合收割机的数值模拟与一系列的修改实验室水槽克服方法上的困难，例如，通过创建稳定的流动路径的代谢率的评估。为了模拟土壤地球化学性能和验证模型结果，在模型和水槽中引入了沉积物结构，导致不同的RT分布。此外，DOC供应量的水槽进行了操作，以测试整个流的代谢反应方面的RT分布。在水槽中，水力条件进行了评估，使用保守的示踪剂和热量作为示踪剂。代谢活动进行了评估，使用氧动力学作为社区呼吸（CR）的代理。停留时间和代谢过程进行了建模，使用多组分反应运输代码称为MIN3P和校准方面的水力条件，使用从水槽实验获得的结果。Monod型表达式用于实现模型中的代谢活性项。利用水文过程模型的结果，RT分布对代谢活动的影响的敏感性分析可以产生支持两者之间存在联系的证据。
The interaction of the water residence time (RT) in hyporheic sediments with the sediment metabolic rates is believed to be a key factor controlling whole stream metabolism. However, due to the methodological difficulties, there is little data that investigates this fundamental theory of aquatic ecology. Here, we report on progress made to combine numerical modelling with a series of modification to laboratory flumes overcoming methodological difficulties e.g. by creating steady flow paths for assessment of metabolic rates. To model the biogeochemical performance and to validate the model results, sediment structures were introduced in both, the model and the flumes, leading to differing RT distributions. Furthermore, the DOC supply in the flumes was manipulated to test the whole stream metabolic response with regard to RT distributions. In the flumes, hydraulic conditions were assessed using conservative tracer and heat as tracer. Metabolic activity was assessed using oxygen dynamics as a proxy of community respiration (CR). Residence time and metabolic processes were modelled using a multicomponent reactive transport code called MIN3P and calibrated with regard to the hydraulic conditions using the results obtained from the flume experiments. Monod type expressions were used to implement metabolic activity terms in the model. Using the results of the hydrological process model, a sensitivity analysis of the impact of RT distributions on the metabolic activity could yield supporting proof of an existing link between the two.
登录
查看更多内容
影响因子：
5.2
作者：
Boano, Fulvio;Camporeale, Carlo;Ridolfi, Luca
通讯作者：
Ridolfi, Luca
75 测定土壤水力特性
影响因子：
8.2
作者：
W. Durner;K. Lipsius
通讯作者：
K. Lipsius
小型沙床溪流中的潜流和总瞬时储存
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
J. Stofleth;F. Shields, Jr.;G. Fox
通讯作者：
G. Fox
DOI：
--
发表时间：
1975
期刊：
影响因子：
--
作者：
T. Rakowska
通讯作者：
T. Rakowska