Department of Irrigation, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran.
Environ Monit Assess. 2011 Jun;177(1-4):273-87. doi: 10.1007/s10661-010-1633-y. Epub 2010 Aug 11.
Sixteen water quality parameters have been monitored at four stations located along the Maroon River during 1989-2008. The trend analysis was performed on seasonal and annual time-scales using the Mann-Kendall test, the Sen's slope estimator and the linear regression. The relationships of the water quality parameters to river discharge were also investigated. The statistical methods showed both positive and negative trends in annual water quality data. However, significant trends were detected by the statistical methods only in calcium, magnesium, sodium absorption ratio, pH, and turbidity series. The results indicated that the concentrations of the water quality parameters increased in spring and winter seasons, while the concentrations were diluted in summer and autumn seasons in the last two decades. Moreover, the highest numbers of significant trends were found in the spring and summer series, respectively. According to the regression analysis, most of the water quality parameters were negatively correlated with river discharge.
1989 年至 2008 年期间，在马伦河的四个站点监测了 16 个水质参数。使用 Mann-Kendall 检验、Sen 的斜率估计器和线性回归，在季节性和年度时间尺度上对趋势进行了分析。还研究了水质参数与河流流量的关系。统计方法显示，年度水质数据呈正、负趋势。然而，只有在钙、镁、钠吸收率、pH 值和浊度系列中，统计方法才检测到显著趋势。结果表明，在过去二十年中，水质参数的浓度在春季和冬季增加，而在夏季和秋季则被稀释。此外，在春季和夏季系列中发现了最多的显著趋势。根据回归分析，大多数水质参数与河流流量呈负相关。
