The Importance of Impoundment interception in Simulating Riverine Dissolved Organic Carbon

IF 4.6 1区地球科学 Q2 ENVIRONMENTAL SCIENCES Water Resources Research Pub Date : 2024-11-06 DOI:10.1029/2024wr038133

JiaoJiao Liu, JunZhi Liu, XinZhong Du, RenKui Guo, Zheng Duan, BinJie Yuan, YongQin Liu

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Abstract

Modeling of riverine dissolved organic carbon (DOC) dynamics is of great importance for the global carbon budget. Impoundment interception changes the travel time of water and DOC from upslope contributing areas, exerting substantial influence on riverine DOC dynamics in the catchments with many impoundments. However, the impact of impoundment interception representation on riverine DOC modeling has not been evaluated so far. This study investigated to what extent impoundment interception representation affects DOC simulations using a newly developed catchment-scale DOC model, which can represent the upslope contributing areas of impoundments and the impoundment interception process. The results showed that streamflow and DOC load simulation were well simulated regardless of whether impoundment interception was represented, but the simulation of DOC concentrations was satisfiable only when impoundment interception was taken into account. The simulation without impoundment interception produced unrealistic fluctuation of DOC concentration due to the direct mixing of DOC from different sources with contrasting concentration gradients. These results underscored the significance of employing an appropriate model structure for riverine DOC simulation. It is strongly recommended that DOC concentration be utilized for model evaluation in order to attain robust simulation outcomes. Moreover, the newly developed model in this study keeps a balance between the completeness of process presentation and model complexity, occupying a unique “ecological niche” among catchment-scale riverine DOC models.

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蓄水池截流对模拟河流溶解有机碳的重要性

河流溶解有机碳（DOC）动力学建模对全球碳预算具有重要意义。蓄水池截流改变了水和溶解有机碳从上坡汇水区流出的时间，对有许多蓄水池的集水区的河流溶解有机碳动力学产生了重大影响。然而，迄今为止，尚未评估过蓄水池截流对河流 DOC 模型的影响。本研究利用新开发的集水区尺度 DOC 模型，研究了蓄水池拦截对 DOC 模拟的影响程度，该模型可表示蓄水池的上坡注入区和蓄水池拦截过程。结果表明，无论是否表示蓄水池截流，都能很好地模拟溪流和 DOC 负荷，但只有考虑到蓄水池截流时，对 DOC 浓度的模拟才能令人满意。在没有蓄水池拦截的模拟中，由于不同来源的 DOC 直接混合，浓度梯度截然不同，导致 DOC 浓度波动不真实。这些结果表明，在河流 DOC 模拟中采用适当的模型结构非常重要。强烈建议利用 DOC 浓度对模型进行评估，以获得可靠的模拟结果。此外，本研究新开发的模型在过程表达的完整性和模型的复杂性之间保持了平衡，在流域尺度的河流 DOC 模型中占据了独特的 "生态位"。

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来源期刊

Water Resources Research 环境科学-湖沼学

CiteScore

8.80

自引率

13.00%

发文量

599

审稿时长

3.5 months

期刊介绍： Water Resources Research (WRR) is an interdisciplinary journal that focuses on hydrology and water resources. It publishes original research in the natural and social sciences of water. It emphasizes the role of water in the Earth system, including physical, chemical, biological, and ecological processes in water resources research and management, including social, policy, and public health implications. It encompasses observational, experimental, theoretical, analytical, numerical, and data-driven approaches that advance the science of water and its management. Submissions are evaluated for their novelty, accuracy, significance, and broader implications of the findings.