Trend study and assessment of surface water quality in the Ebro River (Spain)
Trend study and assessment of surface water quality in the Ebro River (Spain)
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DOI：
10.1016/j.jhydrol.2008.07.048
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发表时间：
2008-11-15
影响因子：
6.4
通讯作者：
Fernandez-Espinosa, A. J.
中科院分区：
文献类型：
--
作者：
Bouza-Deano, R.;Ternero-Rodriguez, M.;Fernandez-Espinosa, A. J.
对 24 年来每月收集的地表水样本中的 34 个物理化学和化学变量进行了分析。它们是从位于西班牙埃布罗河沿岸受人为和季节性影响的 13 个采样站确定的。趋势研究是使用曼-肯德尔季节检验和森斜率估计器进行的。结果显示，参数随时间的变化主要是由于 1981 年至 2004 年期间埃布罗盆地磷酸盐浓度降低和 pH 值升高所致。还通过显示方法（聚类分析）和无监督模式识别（主成分分析）对数据进行探索性分析，试图区分水质变化的来源。 PCA 允许识别以下因素：地质、气候和人为因素。确定了影响河水质量和水化学的空间和季节变化源。 (C) 2008 Elsevier B.V. 保留所有权利。
Thirty-four Physical-chemical and chemical variables were analysed in surface water samples collected every month over a period of 24 years. They were determined from thirteen sampling stations located along the Spanish Ebro River affected by anthropogenic and seasonal influences. The trend study was performed using the Mann-Kendall Seasonal Test and the Sen's Slope estimator. Results revealed parameter variation over time due mainly to the reduction in phosphate concentration and increasing pH levels at the Ebro Basin during the 1981-2004 period. Exploratory analysis of data was also carried out by display methods (cluster analysis), and unsupervised pattern recognition (principal component analysis) in an attempt to differentiate between sources of variation in the water quality. PCA has allowed the identification of the following factors: geologic, climatic and anthropogenic. Spatial, and seasonal sources of variation were identified that affect the quality and hydrochemistry of river water. (C) 2008 Elsevier B.V. All rights reserved.