Abstract
The conductivity of the streamflow is controlled by the content of the dissolved components, which mainly come from the water-rock interaction of the baseflow. This paper showed that the conductivity sequence controlled by water-rock interaction in the runoff process can be screened out by the two-parameter recursive filter method. The analysis of the streamflow and conductivity series of USGS gauge numbered 02298202 from October 2005 to October 2009 showed that the water-rock interaction controls the conductivity characteristics of the stage of streamflow recession. And with the increase of water-rock interaction time (T), the conductivity of the streamflow increases in a power function, which satisfies the equation C = 252.92T0.262.
Highlights
Streamflow is usually composed of surface runoff and baseflow, where the baseflow is the discharge of groundwater that has undergone long-term water-rock interactions, while the surface runoff comes directly from precipitation without water-rock interaction [1]
The streamflow in flood season is mainly composed of surface runoff, while in the dry season it is mainly composed of baseflow, so the streamflow conductivity is negatively correlated with the streamflow [3]
According to the separation results of the two-parameter recursive filtering method, a conductivity series with the daily average baseflow ratio greater than 0.9 can be screened, which can be used to identify the characteristics of streamflow conductivity directly controlled by water-rock interaction
Summary
Streamflow is usually composed of surface runoff and baseflow, where the baseflow is the discharge of groundwater that has undergone long-term water-rock interactions, while the surface runoff comes directly from precipitation without water-rock interaction [1]. According to the separation results of the two-parameter recursive filtering method, a conductivity series with the daily average baseflow ratio (fbf,the ratio of daily baseflow and total streamflow) greater than 0.9 can be screened, which can be used to identify the characteristics of streamflow conductivity directly controlled by water-rock interaction. Taking the streamflow and conductivity monitoring data of the USGS gauge numbered 02298202 from October 2005 to October 2009 as an example, this paper expounded the process of exploring the influence of water-rock interaction on streamflow conductivity based on hydrograph separation. This hydrological gauge is located in Shell Creek, Florida, at Latitude 26°59'04", Longitude 81°56'09", with a catchment area of 965.7 km.
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