Kinetics of peat soil dissolved organic carbon release to surface water. Part 2. A chemodynamic process model.
Kinetics of peat soil dissolved organic carbon release to surface water. Part 2. A chemodynamic process model.
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DOI：
10.1016/j.chemosphere.2005.02.047
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发表时间：
2005-09
期刊：
影响因子：
8.8
通讯作者：
L. Thibodeaux;L. Aguilar
中科院分区：
文献类型：
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作者：
L. Thibodeaux;L. Aguilar
在泥炭土上建造的临时水库可能会因为溶解有机碳(DOC)的升高而表现出水质损害。微生物腐烂床中的有机碳，然后释放出来，产生“茶”色水，可能需要在使用前进行处理。这篇论文包含了一个基于过程的数学模型，它量化了DOC从床上的释放和在水柱中的积聚。模型元素基于微生物DOC产生率和底泥运移动力学，描述了其从有机土壤系统中的释放。它依赖于从一项实验研究(第1部分)获得的实验室数据，该实验研究旨在模拟建立在泥炭土壤上的水上水库的DOC化学动力学。根据实验结果构建了DOC的两步释放过程。模型机理假定土壤表层的快速释放率为“茶袋型”释药过程。紧随其后的是不断产生的一部分，然后由上层土壤中正在进行的微生物过程以恒定的速度超时释放。活动层的深度，选择为h*=0.3 cm，是模型中的单个可调参数。对浓度的预测与实验室模拟和野外观测结果一致。微宇宙床和水柱中DOC浓度的实测值和模型计算值被用来检验所提出的模型的关键特征。按照设想和结构，这似乎是量化位于泥炭-土壤床上的水库水柱的DOC释放后果的现实的第一步。为了说明模型的强弱和不确定性，本文最后对一个假想的储集层进行了应用。
Temporary water reservoirs built upon peat soil may exhibit water quality impairment from elevated dissolved organic carbon (DOC). Microbiological decay of the organic carbon in the bed with subsequent release produces “tea” colored water which may require treatment prior to use. This paper contains a process-based mathematical model that quantifies the DOC release from the bed and its build-up in the water column. The model elements are based on microbial DOC production rates and bed sediment transport kinetics describing its’ release from the organic soil systems. It relies on laboratory data obtained from an experimental study, Part 1, designed to simulate the DOC chemodynamics of aquatic reservoirs built upon peat soils. A two-step DOC release process was structured based on the experimental findings. The model mechanism assumes a quick release fraction that characterizes the upper soil surface layers as a “tea bag” type release process. This is followed by a fraction that is continuously produced and then released at a constant rate overtime by on-going microbial processes within the upper soil layers. The depth of the active layer, selected as h*=0.3cm, is the single adjustable parameter in the model. Concentration predictions of the are consistent with the laboratory simulations and field observations. Measured vs. model-calculated DOC concentrations for both in the microcosm bed and water column are used to test critical features of the proposed model. As conceived and structured it appears to be a realistic first step in quantifying the DOC release consequences for the water column of a reservoir sited upon a peat-soil bed. The development ends with an application to a hypothetical reservoir in order to illustrate model strengths and uncertainties.