Temporal Variation of Water Quality in Nilwala River, Southern Province, Sri Lanka

Proceedings of International Forestry and Environment Symposium Pub Date : 2024-02-15 DOI:10.31357/fesympo.v27.7201

Diwyanjalee G.R., Premaratne W.A.P.J.

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Abstract

This study intended to investigate the temporal variation of water quality of the Nilwala river in the Matara district and to determine how the changes in rainfall affect to river water quality. Water samples were collected monthly from March 2019 to October 2019 (considering the second Inter monsoon season and first inter-monsoon season) at eight locations along the main river. Water quality parameters such as chemical oxygen demand (COD), biological oxygen demand (BOD), pH, electrical conductivity, temperature, alkalinity, hardness, chloride, nitrate and phosphate were analyzed using APHA 23rd edition of standard methods for the examination of water and wastewater. Experimental results were statistically analyzed by Two-way ANOVA using Minitab 17. The pH, EC, temperature, alkalinity and nitrate concentration showed statistically significant differences among the months (p<0.001) and those showed statistically significant differences with monthly rainfall (p< 0.001). There is a statistically significant relationship between rainfall and month (p<0.001). There is a statistically significant relationship between rainfall and sampling location (p<0.001). The highest rainfall was recorded from august to November (2nd inter-monsoon season) and secondly from March to May (1st inter-monsoon season) was recorded. Conductivity, pH and temperature were decreased from March to June. This may due to 1st inter monsoon rainfall. Conductivity was increased during august-november. Flooding can increase conductivity when it washes salts and minerals from the soil into the water. Nitrate concentration in the majority of the locations was increased during march-may. Total alkalinity, pH and nitrate were increased from august to November. The temperature of river water at all locations decreased from august- November. In conclusion, the pH, EC, temperature, alkalinity and nitrate concentration showed statistically significant differences among each month. It may due to variation of rainfall. Upper part of Nilwala River had a higher rainfall than lower basin. Keywords: Conductivity, Nilwala River, pH, temporal variation, Water quality

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斯里兰卡南部省尼尔瓦拉河水质的时间变化

本研究旨在调查马塔拉地区尼尔瓦拉河水质的时间变化，并确定降雨量变化对河流水质的影响。从 2019 年 3 月至 2019 年 10 月（考虑到第二个季风间歇期和第一个季风间歇期），每月在主河沿岸的八个地点采集水样。水质参数，如化学需氧量（COD）、生物需氧量（BOD）、pH 值、电导率、温度、碱度、硬度、氯化物、硝酸盐和磷酸盐，均采用 APHA 第 23 版水和废水检验标准方法进行分析。实验结果使用 Minitab 17 进行了双向方差分析。各月的 pH 值、EC 值、温度、碱度和硝酸盐浓度在统计学上有显著差异（p<0.001），且与月降雨量在统计学上有显著差异（p<0.001）。降雨量与月份之间有显著的统计学关系（p<0.001）。降雨量与采样地点之间有明显的统计学关系（p<0.001）。8 月至 11 月（第二个季风间歇期）的降雨量最大，其次是 3 月至 5 月（第一个季风间歇期）。电导率、pH 值和温度在 3 月至 6 月期间有所下降。这可能是由于季风间歇期降雨所致。电导率在 8 月至 11 月期间上升。洪水会将土壤中的盐分和矿物质冲入水中，从而增加电导率。大多数地点的硝酸盐浓度在 3 月至 5 月期间都有所增加。8 月至 11 月期间，总碱度、pH 值和硝酸盐含量都有所增加。从 8 月到 11 月，所有地点的河水温度都有所下降。总之，各月的 pH 值、EC 值、温度、碱度和硝酸盐浓度在统计学上存在显著差异。这可能与降雨量的变化有关。尼尔瓦拉河上游地区的降雨量高于下游流域。关键词电导率尼尔瓦拉河 pH 值时间变化水质

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Proceedings of International Forestry and Environment Symposium

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