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首页> 外文期刊>Journal of Enviromental Quality >Evaluation of Intra-annual Variation in U.S. Geological Survey National Water Quality Assessment Ground Water Quality Data
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Evaluation of Intra-annual Variation in U.S. Geological Survey National Water Quality Assessment Ground Water Quality Data

机译：美国地质调查局年度水质变化的评估国家水质评估地下水水质数据

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Assessment of ground-water quality trends under the U.S. Geological Survey National Water-Quality Assessment Program (NAWQA) included the analysis of samples collected on a quarterly basis for 1 yr between 2001 and 2005. The purpose of this quarterly sampling was to test the hypothesis that variations in the concentration of water-quality parameters of selected individual wells could demonstrate that the intra-annual variation was greater or less than the decadal changes observed for a trend network. Evaluation of more than 100 wells over this period indicates that 1 yr of quarterly sampling is not adequate to address the issue of intra-annual variation because variations seem to be random and highly variable between different wells in the same networks and among networks located in different geographical areas of the USA. In addition, the data from only 1 yr makes it impossible to assess whether variations are due to univariate changes caused by land use changes, hydrologic variations due to variable recharge, or variations caused by ground-water pumping. These data indicate that funds allocated to this activity can be directed to the collection of more effective trend data, including age dating of all wells in the NAWQA network using multiple techniques. Continued evaluation of data and updating of monitoring plans of the NAWQA program is important for maintaining relevance to national goals and scientific objectives. nnnAbbreviations: AgLUS, agricultural land use study • LUS, land use
机译：在美国地质调查局国家水质评估计划（NAWQA）下对地下水水质趋势的评估包括对2001年至2005年之间每1年按季度收集一次的样本进行分析。本季度抽样的目的是检验假设。所选单个井的水质参数浓度变化可能表明，年内变化大于或小于趋势网络观测到的年代际变化。在此期间对超过100口井的评估表明，一年的季度采样不足以解决年内变化的问题，因为同一网络中不同井之间以及位于不同网络中的网络之间的变化似乎是随机且高度可变的美国的地理区域。此外，仅1年的数据就无法评估变化是由于土地利用变化引起的单变量变化，因补给量变化引起的水文变化还是由于地下水抽取引起的变化。这些数据表明，分配给该活动的资金可以用于收集更有效的趋势数据，包括使用多种技术对NAWQA网络中所有井的年限进行日期估算。持续评估数据和更新NAWQA计划的监测计划对于保持与国家目标和科学目标的相关性很重要。 nnn缩写：AgLUS，农业土地利用研究•LUS，土地利用

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