Spatial-temporal distribution and source apportionment of riverine dissolved organic carbon in the Miyun section of the Chaobai River in Beijing, China

Water-Energy Nexus Pub Date : 2023-10-17 DOI:10.1016/j.wen.2023.10.003

Junjie Wang , Xiao Pu , Ruining Zhang , Xunliang Liu , Yuhu Zhang , Jian Wang , Yifan Wang , Mingxue Meng , Siqi Li

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Abstract

Dissolved organic carbon (DOC) is indicative of water quality in drinking source water and has an impact on drinking water treatment. Exploring occurrence of DOC in drinking source water is of great significance for the drinking water safety in Beijing. This study elucidated spatial-temporal DOC dynamics in the Miyun section of Chaobai River in Beijing of China and identified sources of DOC based on DOC fluorescent spectral characteristics. Results showed that the average riverine DOC concentration was 30.60 mg/L. DOC concentrations in the Miyun section of the Chaobai River were 30.40, 30.24, and 31.09 mg/L in spring, summer and autumn, respectively. DOC concentrations at the three segments of the Miyun section of the Chaobai River (the Chaohe River, the Baihe River and the Chaobai River) were 29.93, 30.29 and 32.57 mg/L, respectively. Land use contributed to DOC variations rather than season and river segment. Significant increases in DOC concentration were observed in river water flowing through farmland and urban areas, and DOC concentration presented the highest after flowing through the farmland area. The results of FI, HIX and BIX showed that DOC mainly came from endogenous sources such as aquatic biological activities, and was less affected by terrestrial inputs. Special attentions ought to be paid on prevention and control of endogenous DOC inputs.

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朝白河密云段河流溶解有机碳时空分布及来源解析

在饮用水源中，溶解有机碳(DOC)是水质的指示物，对饮用水处理有重要影响。探讨饮用水水源中DOC的发生情况对北京市饮用水安全具有重要意义。研究了朝白河密云段DOC的时空动态特征，并基于DOC荧光光谱特征确定了DOC的来源。结果表明，河流DOC平均浓度为30.60 mg/L。潮白河密云段春季、夏季和秋季的DOC浓度分别为30.40、30.24和31.09 mg/L。潮白河密云段(潮河、白河和潮白河)的DOC浓度分别为29.93、30.29和32.57 mg/L。土地利用对DOC变化的影响大于季节和河段。流经农田和城区的河水DOC浓度均显著升高，流经农田后DOC浓度最高。FI、HIX和BIX结果表明，DOC主要来自水生生物活动等内源，受陆源输入的影响较小。内源性DOC投入物的防治应引起特别重视。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Water-Energy Nexus

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