风浪对浅水湖泊水质的影响机制

以太湖重要的浅水湖湾——东太湖为例,应用经典风浪经验公式,将风速转化为浪高,以直接体现风浪强度,在分析其与污染底泥卷起、水质指标相关关系的基础上,对风浪影响湖区水质的机制进行进一步探究。结果表明:随着风速、浪高的增加,水体浑浊度增加,偏北风作用下湖区浑浊度更高;DO的质量浓度呈降低趋势,全年浓度呈现冬季偏高而夏季偏低的规律;COD的质量浓度呈增加趋势,全年浓度呈现冬季偏高而夏季偏低的规律;TN的质量浓度与风速相关关系不明显,全年浓度呈现夏季偏高而冬季偏低的规律;浑浊度与COD存在较好的相关性。确定风浪对湖区水质的影响机制,旨在为针对性地制定湖泊水质改善措施提供技术支撑。

Influencing mechanism of wind waves on water quality in shallow lake

Taking East Taihu Lake, an important shallow water bay of Taihu Lake, as an example, the influencing mechanism of wind waves on water quality in the shallow lake was discussed. The wind speed was translated into wave height using the classic wind-wave empirical formula to directly reflect the strength of wind wave, and the correlation relationships between the wind wave, polluted sediment rolling up, and water quality indices were analyzed. Results show that the water turbidity increases with the wind speed and wave height and is higher under the north wind. The concentration of DO decreases with the wind speed and wave height and is higher in winter and lower in summer. The concentration of COD increases with the wind speed and wave height and is higher in winter and lower in summer. The concentration of TN has no obvious correlation with the wind speed and is higher in summer and lower in winter. The water turbidity has good correlation with the concentration of COD. Study on the influencing mechanism of wind waves on water quality in the shallow lake can provide technical support for establishing lake water quality improvement measures.