VERTICAL INFILTRATION UNDER CONDITIONS OF CONSTANT RAINFALL FLUX
Abstract
THE PHYSICS OF VERTICAL INFILTRATION UNDER A CONSTANT RAINFALL FLUX, GREATER THAN THE SATURATED HYDRAULIC CONDUCTIVITY, ARE INVESTIGATED AND COMPARED TO THOSE PERTAINING TO THE VERTICAL INFILTRATION PROCESS UNDER CONSTANT HEAD AT THE INFILTRATION SURFACE. FROM THE ARGUMENTS DEVELOPED THEORETICALLY THE FOLLOWINGCONCLUSIONS ARE REACHED: 1) THE MOISTURE PROFILE PREVAILING AT TIME T THAT PONDING OF THE INFILTRATION SURFACE STARTS DURING THE RAINFALL PROCESS, IS IDENTICAL WITH THE PROFILE WHICH HAS BEEN DEVELOPED DURING FLOODING INFILTRATION AT AN EARLIER TIME TC AT WHICH THE INFILTRATION RATE IS EQUAL TO THE RAINFALL FLUX. 2) THE RAINFALL PROFILE DEVELOPMENT AFTER T IS THE SAME AS THAT OF THE PROFILE UNDER FLOODING AFTER TC THE TWO PROFILES HAVING A CONSTANT TIME LAG EQUAL TO (T-TC). 3) THE GREEN AND AMPT ANALYSIS, AS IT HAS BEEN APPLIED TO THE CONSTANT FLUX RAINFALL INFILTRATION, PRESUPPOSES THE IDENTITY OF THE PROFILES MENTIONED ABOVE. 4) THE PONDING TIME T, FOR A GIVEN RAIN ...
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