Quantify the Pore Water Velocity Distribution by a Celerity Function

摘要: Celerity and velocity of subsurface flow in soil porous medium are intimately linked with tracer transport, while only few current studies focused on their relations. This study conducted theoretical analyses based a pore bundle model, under which celerity unsaturated is equivalent to maximum velocity. Furthermore, 3 models Brooks-Corey model unmodified modified Mualem-van Genuchten models, we used function derive breakthrough curves aiming quantify the advective transport for 5 typical textures. The results showed that near-saturated conditions can be up 100 times larger than saturated hydraulic conductivity, small volumetric fraction (<15%) pores contributed more half specific discharge. First arrival time extensive tailing were controlled by distribution, accordingly. As kinematic ratio remained constantly each soil, it over average We also found bimodal (for dual-permeability model) may result similar conductivity functions different parameter sets, but celerities different. proposed assist investigating could predict first conservative tracer.