Seepage Meter - Change of Stream Stage

Comparison between values of water level changes in a seepage meter from analytical ((8), solid lines) and numerical (MODFLOW, open symbols) simulations of the seepage meter. The blue curves are for a stable stream stage, the orange curves are for a stream rise of 0.3 m/day, and the green curves are for a stream drop of -0.1 m/day. In all cases seepage was +1 m/day and Kv = 1 m/day. Note that the slope of all curves at time=0 gives the seepage rate and is independent of the changing stream stage.

本图对比了渗流仪（seepage meter）水位变化值的两类模拟结果：一类为解析解模拟（对应公式(8)，以实线表示），另一类为数值解模拟（采用MODFLOW软件，以空心符号表示）。其中，蓝色曲线对应稳定河道水位工况，橙色曲线对应河道水位以0.3 m/天的速率抬升的工况，绿色曲线对应河道水位以0.1 m/天的速率下降的工况。所有工况下的渗流速率均为+1 m/天，垂向渗透系数（Kv）为1 m/天。需注意，所有曲线在t=0时刻的斜率即为渗流速率，且该速率不受河道水位变化的影响。