Sub-surface irrigation with porous clay pipe can be an efficient, water saving method of irrigation for many less developed arid and semi-arid regions. Maximizing the efficiency of clay pipe irrigation requires guidelines and criteria for system design and operation. In this study, experimental and simulated (with HYDRUS (2D/3D)) soil wetting patterns were investigated for sub-surface pipe syst...

to try and ascertain the relative importance of different soil properties for calibration. This approach has good Many empirical formulas relating TDR-measured permittivity (Ka) utility for finding simple and practical equations that can to volumetric water content ( ) have been presented owing to the lack of a robust and accurate physically derived model describing this be used to estimate . H...

An analysis is developed to calculate the response of laterally loaded piles in multilayered elastic media. The displacement fields in the analysis are taken to be the products of independent functions that vary in the vertical , radial and circumferential directions. The governing differential equations for the pile deflections in different soil layers are obtained using the principle of minim...

In this study, we derive analytical solutions of the first two moments (mean and variance) of pressure head for one-dimensional steady state unsaturated flow in a randomly heterogeneous layered soil column under random boundary conditions. We first linearize the steady state unsaturated flow equations by Kirchhoff transformation and solve the moments of the transformed variable up to second ord...

In this paper, an incremental technique based on cyclic loading is developed to implement shakedown analysis for soils in the framework of elastic-plastic analysis without utilization of the classical shakedown theorems. A finite element model together with the use of ABAQUS is established for soil structures subjected to cyclic loads, where the Mohr-Coulomb yield criterion with associated plas...

Forty years after conversion from chaparral to perennial veldt grass in the San Dimas Experimental Forest, we compared land surface and soil properties between areas of the two vegetation types. Our objective was to evaluate the impact of this vegetation conversion on the soil physical properties likely to impact zero-order watershed hydrology. In three watersheds of each vegetation type, surfa...

Signals generated by moving tracked vehicles can be significantly affected by near-surface materials including pavements, compacted soils, shallow bed rock, and the water table. The ways that seismic signals depend on these surface layers are examined by analyzing impulsive point forces applied at the earth-air interface. Fields are calculated using a plane layered frequency domain wavenumber m...

In this paper we present an Image-Based Rendering method for post-warping LDI’s in real-time on existing systems. The algorithm performs accurate splatting at low computational costs, reduces memoryaccess bottlenecks, enables us to trade-off the quality for the speed, and is simple to implement.

A new fluid property module, EOSRn, was developed for TOUGH2 to simulate the transport of the radon gas (Rn) in saturatedunsaturated soils. It is an enhanced version of the EOS7R module for radionuclide transport, with a source term added in the transport equation to model radon generation by emanation from radioactive decay of the soil radium (Ra) content. We implemented physical properties of...