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大沽河是胶州湾入海径流量最大的河流,对其入海口海水溶解氧含量进行分析可以衡量水质的好坏,为大沽河污染治理效果提供依据。本文基于2016年11月6日—2017年6月20日期间大沽河口底层海水温度和溶解氧浓度等数据,对其底层海水溶解氧浓度的时间变化特征及影响因素进行了分析,并对水质进行了评估。结果表明,观测期间大沽河口海水溶解氧浓度以季节变化为主,秋季至冬季升高,冬季至夏季降低,其中1月平均值最高,约为11.86 mg/L,6月份最低,约为6.17 mg/L。影响大沽河口海水溶解氧浓度变化的主要因素是海水温度,溶解氧浓度随着温度的季节性变化而变化。在大风天气的影响下,溶解氧浓度在秋季末至春季初期出现了过饱和的现象。大沽河口底层海水溶解氧浓度受到潮汐作用的影响存在半日周期和日周期的变化特征。在观测期间大沽河口不存在溶解氧浓度低于二类水质标准的现象。
Abstract：Dagu river is the largest river around the Jiaozhou Bay, the content of dissolved oxygen in the estuary can be used to measure the quality of water and provide basis for the pollution treatment effect of Dagu River. There are few studies on the temporal variation of Dissolved Oxygen(DO) concentration in seawater in the estuary of Dagu River. Based on observations of the temperature, salinity, pressure, and DO data of the bottom water obtained by a real-time online observation system deployed in the estuary of Dagu River from November 06, 2016 to June 20, 2017, we investigated the temporal variations of the DO and contributions from water temperature, salinity, water depth and wind speed and the water quality was evaluated. The results show that during the observation period, the DO is dominated by its seasonal variation, it increases gradually from autumn to winter, and decreases gradually from winter to summer. For monthly mean, the DO is lowest in June, being 6.17 mg/L, while highest in January, being 11.86 mg/L. The main influencing factors of DO in the estuary of Dagu River is seawater temperature, the overall trend of DO varies with the seasonal change of temperature. Under the influence of strong wind, the DO is over saturated at the late of Autumn and early Spring. The DO in the bottom of sea is partly affected by the tidal effect, and there is a trend of half day cycle and daily cycle. The current study indicates that there does not exist the phenomenon of DO lower than national type Ⅱ water quality and there is basically no pollution in the estuary of Dagu River during the observation period.
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基本信息:
DOI：10.16441/j.cnki.hdxb.20180170
中图分类号:X145
引用信息:
[1]李兆钦,李欣,孙利元,等.大沽河口底层海水溶解氧浓度分析[J],2019,49(09):23-33.DOI:10.16441/j.cnki.hdxb.20180170.
基金信息:
山东省重点研究发展计划项目(2016ZDJS09A02);; 国家自然科学基金项目(41476002;41776012;41506008)资助~~
2018-04-16
2018
2018-05-03
2019-06-04
2019
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