Abstract
At substantiating land amelioration and land management designs, as well as during periods of operation and reconstruction of water facilities, information support plays an important role in relation to the hydrophysical properties of soil. Effective implementation of this support faces a number of challenges. Such problems include the very high laboriousness of carrying out the corresponding engineering surveys and laboratory studies. In this regard, the methods of indirect estimating the hydrophysical properties, the measurement of which requires considerable labor, are very in demand for land amelioration and land management practices. An equally acute problem is the problem of the functional representation of the coefficients of the Richards equation, which is widely used in engineering-hydrological calculations. The paper suggests: 1) the original method for assessment of the ratio of the values of the hydraulic conductivity function of soil to the moisture filtration coefficient using data from direct measurements of the water-retention capacity of soil carried out according to the standard procedure; 2) the mathematical model describing the hydrophysical properties of soil, and the system of functions with interpreted parameters that physically adequately describe the coefficients of the Richards equation. In carrying out the study, data on soils of different texture were used. A sufficiently low error in the dot approximation (fitting-procedure) of the experimental data confirms the physical adequacy of the proposed system that includes the functions describing the coefficients of the Richards equation.
Highlights
In the construction industry, an important role is played by engineering surveys conducted to study the hydrological conditions of the soils of the erection of buildings and structures sites
The search for a solution to this equation is reduced to a functional representation of these coefficients in the form of continuous dependencies on the capillary moisture pressure
The primary function of the differential moisture capacity is by definition a function of the integral moisture capacity, which describes the water-retention capacity of the soil continuum stratum as a relationship between the volumetric water content and the capillary moisture pressure of the calculated layer
Summary
An important role is played by engineering surveys conducted to study the hydrological conditions of the soils of the erection of buildings and structures sites. The relationship between volumetric water content and hydraulic conductivity of capillary moisture pressure is described by empirical formulas that approximate point data of direct measurements with some error. With this approach, two problems inevitably arise. The second problem is the following: if in the calculation of the coefficient of the Richards equation that describes the differential moisture capacity, the operation of differentiating the approximation of the function of the integral moisture capacity is applied, significant errors may arise. The use of iterations inevitably leads to a multiplication of the error in the results of calculations
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