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首页> 外文期刊>Hydrology research >Water quality of lowland, permeable Chalk rivers: the Frame and Piddle catchments, west Dorset, UK
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Water quality of lowland, permeable Chalk rivers: the Frame and Piddle catchments, west Dorset, UK

机译：低地，可渗透的粉笔河水质：英国多塞特郡西部的“框架和集水区”集水区

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摘要

This paper provides a baseline interpretation of extensive hydrochemical characteristics of UK Chalk catchments based on the Frome/Piddle (west Dorset), a major component of the LOCAR (Lowland Catchment Research) programme. It examines a wide range of chemical determinands using data from two long-term (1979-2000) river water monitoring sites. The water quality of the Frome and Piddle is very similar to that of agricultural catchments associated with Chalk aquifers. Waters are of a calcium bicarbonate type and nutrient bearing. In general, there are poor correlations between major ion determinands and between chemical concentrations and flow due to the large groundwater storage which buffers chemical variability. Hence, there are no major chemical gradients within the aquifer to provide distinct water end-member chemistries for contrasting hydrochemical environments to allow chemical hydrograph separation on the basis of flow. NO_3-N and soluble reactive phosphorus (SRP) are the dominant species of dissolved N and P, respectively. NO_3-N sources both within the aquifer and within the soils contribute to relatively high concentrations, with average values close to those of other agriculturally impacted catchments. SRP concentrations are generally lower than for high agriculturally, urban and industrially impacted catchments. High correlations between Al, Cu, Fe, Mn and Zn occur due to the association of these trace metals with the soil-forming oxide and hydroxide ions present in suspended solids. Biological process influence SiO_2, pH and EpCO_2 levels. Average levels of EpCO_2 at 4.15 and 5.52 times atmospheric pressure in the Frome and Piddle, respectively, indicates that the river waters have not fully degassed to equilibrium with the atmosphere, suggesting a short residence time of spring waters in the river channel.
机译：本文基于Frome / Piddle（西多塞特郡）（LOCAR（低地集水研究）计划的主要组成部分），提供了英国粉笔集水区广泛水化学特征的基线解释。它使用来自两个长期（1979-2000年）河水监测站点的数据来检查各种化学测定方法。弗罗姆和皮德尔的水质与粉笔蓄水层相关的农业流域的水质非常相似。水是碳酸氢钙类型的，具有营养。通常，由于大量的地下水储存缓冲了化学变化性，因此主要的离子测定值之间以及化学浓度和流量之间的相关性很差。因此，在含水层内没有主要的化学梯度来提供独特的水端元化学，以对比水化学环境，从而允许基于流量进行化学水位分离。 NO_3-N和可溶性反应性磷（SRP）分别是溶解氮和磷的主要物质。含水层内部和土壤内部的NO_3-N来源均导致相对较高的浓度，其平均值接近其他受农业影响的集水区的平均值。 SRP浓度通常低于受农业，城市和工业影响较高的流域。 Al，Cu，Fe，Mn和Zn之间存在高度相关性，这是由于这些痕量金属与悬浮固体中存在的形成土壤的氧化物和氢氧根离子有关。生物过程影响SiO_2，pH和EpCO_2含量。在弗罗姆和比德尔的大气压力下，EpCO_2的平均水平分别为大气压力的4.15和5.52倍，这表明河水尚未完全脱气以与大气保持平衡，这表明泉水在河道中的停留时间较短。

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  • 来源
    《Hydrology research》 |2010年第2期|p.75-91|共17页
  • 作者

    N. J. K. Howden; C. Neal; H. S. wheater; S. Kirk;

  • 作者单位

    National Soil Resources Institute, Natural Resources Department, Cranfield university, Cranfield Bedfordshire MK43 0AL, UK;

    Centre for Ecology and Hydrology, Maclean Building, Crowmarsh Gifford, wallingford Oxfordshire OX10 8BB, UK;

    Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;

    Environment Agency Science Group, Head Office, Block 1, Government Buildings, Burghill Road, Westbury-on-Trym, Bristol BS10 6BF, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    chalk catchment; frome; lowland permeable catchment; piddle; water chemistry;

    机译：粉笔集水区;从低地渗透性集水区;iddle水化学;

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