A soil-water characteristic (SWC) curve describes the amount of water retained in a soil (expressed as mass or volume water content, m or v) under equilibrium at a given matric potential. An SWC is an important hydraulic property, related to size and connectedness of pore spaces, hence strongly affected by soil texture and structure, and by other constituents, including organic matter. Modeling...

The increase in rainfall intensities due to climate change affect the entire globe. In particular, Singapore suffers from floods and rising of coastlines. Notably, Bukit Timah Region Singapore, are getting more intense, region houses multitudes low-rise constructions with shallow foundations. Damages ranging physical, terms motor vehicle property damages, intangible losses such as major traffic...

It is commonly assumed that the fully-saturated scenario represents critical shear strength condition for geotechnical structure design; nevertheless, this not case when dynamic of unsaturated soil considered, because water content affects transfer seismic waves through porous medium and into a structure. important to better understand behavior so response during an earthquake could be establis...

Rainfall-induced slope failures commonly occur in residual soil slopes. Slope are triggered by the reduction strength. This is attributed to decrease suction due rainwater infiltration. covers like capillary barrier system and vegetative cover effective methods that can be used prevent rainfall-induced failures. The able limit infiltration, vegetation contribute increase Vetiver grass widely pl...

There are many empirical equations published for unsaturated fine-grained soils. However, there is only one equation established silty sand using the shear-box test and filter-paper-based suction test, but with range of 0 to 200 kPa. It reported that a significant discrepancy between predicted values results apparent cohesion within 100 kPa coarse-grained The purpose this research study effect ...

Abstract Shear strength of unsaturated soils is an important engineering property that required for addressing geotechnical problems, the prediction which remains to be a challenging task design engineers due complex interaction problem. This study presents new shear equation based on micromechanical model and disturbed state concept soils. The original point this considering solid contact area...

The water retention curve, which relates the matric potential, ?, to content, ?, is essential describe flow processes in unsaturated zone and provides useful information for environmental engineering applications. There are few studies devoted measuring rock curves due rock’s tightness, makes it more technically difficult use specific methods. In this study, we tested four different methods mea...

Abstract Aims Test the effects of root drying on biomechanical properties fibrous roots. Methods Tensile strength and Young’s modulus Festuca arundinacea roots were tested after full hydration during progressive drying. Root diameter, water loss, content measured for all treatments. Results Hydrated showed weak relations between diameter. After only 30 min air-drying, both tensile increased sig...

The epidemiology of sclerotinia rot of carrot was investigated on carrot ‘Cellobunch’ during 1999 and 2000 in Ontario. Apothecia were first detected in the crop in early August to mid-September, after the carrot canopy closed and after 7–11 days with soil matric potentials between –0.1 and –0.4 bars and soil temperatures between 14 and 23 °C. Ascospores were first detected in mid-July to mid-Au...