使用ce - quality - w2模拟热带水库水质:处理数据稀缺性、城市污染和水文气候季节性

Pub Date : 2023-05-22 DOI:10.1590/2318-0331.282320230003
I. L. Lima Neto
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引用次数: 1

摘要

本研究采用二维水动力学模型(ce - quality - w2)模拟巴西塞埃尔福塔莱萨热带水库的水质动态。虽然降雨基本上集中在第一个学期,但这个水库全年接收来自城市集水区的未经处理的污水。为了解决数据稀缺的问题,对模型进行了简化,并进行了多次调整,在建模过程中只保留了温度(T)、溶解氧(DO)、叶绿素a (Chla)和磷酸盐(PO4)等参数。此外,对水库入口浓度的时间演化进行了不同的假设:恒定值、阶跃和线性变化。结果表明,简化模型能较好地预测T、DO、Chla和PO4的季节变化。模型结果与测量值之间的最佳拟合是在进口浓度线性变化的假设下获得的,其次是恒定值和阶跃变化的假设。结果表明,PO4呈现出完全的混合行为,从湿季到旱季浓度明显增加,而T、DO和Chla呈现出昼夜交替的分层-去分层模式,全年无相关变化。不同情景的模式模拟也表明,第二学期Chla浓度显著降低,但外部负荷减少对模式输出的影响强于水文气候变率。本研究提出的建模方法是一种简单的方法来应对热带水库的数据稀缺、城市污染和水文气候季节性。
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Modeling water quality in a tropical reservoir using CE-QUAL-W2: handling data scarcity, urban pollution and hydroclimatic seasonality
ABSTRACT This study applies a 2-D hydrodynamic model (CE-QUAL-W2) for simulating water quality dynamics in a tropical reservoir located in Fortaleza, Ceará, Brazil. While rainfall concentrates basically in the first semester, this reservoir receives untreated sewage from an urban catchment throughout the year. To deal with data scarcity, model simplifications are justified and several adjustments are carried out, so that only the parameters temperature (T), dissolved oxygen (DO), chlorophyll a (Chla) and phosphate (PO4) are kept in the modeling process. Additionally, different assumptions are performed regarding the time-evolution of reservoir inlet concentrations: constant values, step and linear variations. The results indicate that the simplified model can predict well the seasonal variations of T, DO, Chla and PO4. The best fitting between model results and measurements are obtained with the assumption of linear variation in inlet concentrations, followed by the assumptions of constant values and step variation. Moreover, the results reveal that while PO4 presents a complete mixing behavior with a clear increase in concentration from the wet to the dry season, T, DO and Chla show an alternating stratification-destratification patter during the day-night but without relevant variations throughout the year. Model simulations of different scenarios also indicate a significant reduction in Chla concentration in the second semester, but external load reduction has a stronger impact on model outputs than hydroclimatic variability. The modeling approach developed in the present study is proposed as a simple way to cope with data scarcity, urban pollution and hydroclimatic seasonality in tropical reservoirs.
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