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2014年8月至2015年9月通过野外在线监测获取岩溶流域连续、高精度的气象、地下水TOC和水文地球化学等数据,利用主成分回归模型探讨流域地下水TOC在不同时间尺度上的输出及影响因素.结果表明在季节时间尺度上,气温和地下水电导率(Sp C)夏季高,冬季低,p H则相反;TOC和浊度冬、夏季高,春、秋季低;地下水TOC和水文地球化学指标对降雨表现出明显的响应过程,但地下水TOC对不同降雨强度的响应时间和过程有明显差异,整体来说,TOC在降雨过程中表现出上升的趋势,而暴雨过后受稀释效应影响呈现下降趋势.主成分回归分析发现降雨、流量和浊度对TOC有正向促进作用,而气温和p H对TOC有负向的影响.
From August 2014 to September 2015, continuous and high-precision meteorological data, TOC and hydrogeochemistry of groundwater were obtained from on-line monitoring in the field. The principal component regression model was used to investigate the output and influence of TOC in different time scales The results show that on the seasonal time scale, air temperature and groundwater conductance (Sp C) are high in summer, low in winter and p H are opposite; TOC and turbidity are high in winter, summer and low in spring and autumn; groundwater TOC and hydrogeochemistry However, the response time and process of groundwater TOC to different rainfall intensity are obviously different. On the whole, TOC shows an upward trend during the rainfall, but is affected by the dilution effect after the rainstorm Trend.Principal component regression analysis found that rainfall, flux and turbidity had a positive effect on TOC while temperature and p H had a negative effect on TOC.