Spatial patterns of surface water quality in the Cértima River basin, central Portugal.
Spatial patterns of surface water quality in the Cértima River basin, central Portugal.
复制标题
葡萄牙中部塞尔蒂玛河流域地表水质的空间格局。
DOI：
10.1039/b914409a
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
J. Keizer
中科院分区：
文献类型：
--
作者：
R. Ferreira;M. Cerqueira;M. T. C. de Melo;Daniela R. de Figueiredo;J. Keizer
Cértima河是流入Pateira de Fermentelos的主要水源，Pateira de Fermentelos是伊比利亚半岛最大的天然湖泊之一，具有较高的保护价值。本研究旨在更全面地了解水质的空间格局，因此，污染问题，特别是上游的Pateira，包括与2003年以前的研究进行比较。为此，2007年5月在29个地点采集了地表水样本，涵盖该流域的四种主要水体，并分析了电导率、溶解氧、生化需氧量、总悬浮固体、各种氮物质、正磷酸盐和叶绿素a。结果证实，沿Cértima河主河道中段存在明显的污染沿着，这可归因于城市和畜牧业废水排放。这对Pateira来说是一个重要的富营养化风险。目前的立法和水管理似乎没有以完全令人满意的方式处理这一风险，因为空间格局以及关键物理化学参数的实际值在2003年至2007年期间似乎没有明显变化。在各种参数中，生化需氧量经常超过法律的水质标准。水体的类型证明有助于解释某些参数的部分变化。这包括右岸和左岸支流之间电导率的明显差异，很好地说明了Cértima盆地的异质性和复杂性。
The Cértima River is the principal source of water flowing into the Pateira de Fermentelos, which is one of the largest natural lakes of the Iberian Peninsula and has elevated conservation value. This study aims at a more comprehensive understanding of the spatial pattern in water quality and, thus, pollution problems in and especially upstream of the Pateira, including a comparison with a prior study in 2003. To this end, surface water samples were collected, in May 2007, at 29 sites covering the basin's four main types of water bodies, and analysed for electrical conductivity, dissolved oxygen, biochemical oxygen demand, total suspended solids, various nitrogen species, orthophosphate and chlorophyll a. The results confirmed the existence of marked pollution along the middle section of the Cértima's main course, which can be attributed to wastewater discharges of urban and animal husbandry origin in particular. This represents an important eutrophication risk to the Pateira. Current legislation and water management does not appear to tackle this risk in an entirely satisfactory manner, since the spatial patterns as well as actual values of key physic-chemical parameters do not appear to have changed markedly between 2003 and 2007. Amongst the various parameters, biochemical oxygen demand stands out for frequently exceeding the legal water quality standards. The type of water body proved helpful to explain part of the variation in some of the parameters. This includes clear differences in electrical conductivity between the right- and left-bank tributaries, illustrating well the heterogeneous and complex character of the Cértima basin.