Modelling streamwater chemistry as a mixture of soilwater end-members ― an application to the Panola Mountain catchment, Georgia, U.S.A.
Modelling streamwater chemistry as a mixture of soilwater end-members ― an application to the Panola Mountain catchment, Georgia, U.S.A.
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DOI：
10.1016/0022-1694(90)90131-g
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发表时间：
1990-08
影响因子：
6.4
通讯作者：
R. Hooper;N. Christophersen;N. Peters
中科院分区：
文献类型：
--
作者：
R. Hooper;N. Christophersen;N. Peters
美国格鲁吉亚帕诺拉山研究集水区的溪流化学，被解释为代表性的土壤水溶液的混合物，被认为是时间不变的第一近似。三个端员从所有采样土壤沃茨的选择进行评估，通过比较观察到的和预测的六种溶质（碱度，硫酸盐，钠，镁，钙和溶解硅），这是假设保守混合的河水浓度，并通过评估的一致性，被认为是在这个流域的水文机制，隐含的水文分离。端元混合分析（EMMA）解释的河水溶质浓度的变化的百分比范围从82%到> 97%，和过程线分离，直观上，物理上是合理的。如果已经确定了正确的端元，则可以通过检查不同负载下每个端元的变化来预测对不同水平的酸性沉积的河水化学响应;不需要水文模型。如果一个传统的水化学模型，这是由降雨量和质量驱动，是理想的，这种分析提供了一个指示的模型结构，将是必要的，以重现两个streamwater和soilwater化学。
Streamwater chemistry at Panola Mountain research catchment, Georgia, U.S.A., is explained as a mixture of representative soilwater solutions that are considered to be temporally invariant to a first approximation. The selection of three end-members from all sampled soil waters is evaluated by comparing the observed and predicted streamwater concentration of six solutes (alkalinity, sulfate, sodium, magnesium, calcium and dissolved silica), which are assumed to mix conservatively, and by assessing the consistency of the implied hydrograph separation with the hydrological mechanisms that are believed to be operating in this catchment. The percentage of variation in the streamwater solute concentrations explained by the end-member mixing analysis (EMMA) ranges from 82 to >97%, and the hydrograph separation is, intuitively, physically reasonable. If the correct end-members have been identified, the streamwater chemical response to different levels of acidic deposition can be predicted by examining the change in each end-member under different loads; no hydrological model is required. If a traditional hydrochemical model, which is driven by rainfall quantity and quality, is desired, this analysis provides an indication of the model structure that would be necessary to reproduce both streamwater and soilwater chemistry.