Lecture15-17(2008) - SOIL WATER CONTENT BULK DENSITY AND...

Info icon This preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
SOIL WATER CONTENT, BULK DENSITY AND POROSITY Soils are often described and classified by their structure and particle size. Bulk density and pore space or porosity provide a more useful physical description of soil. Soil bulk density is a measure of soil compaction and strength. Porosity also provides some estimate of compaction, and the maximum space available for water (at saturation) or air. Read : Chapter 1 (p. 12-17), and 6 (p. 93-105) — Introduction to Environmental Soil Ph ysics
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
SOIL WATER CONTENT, BULK DENSITY AND POROSITY (cont.) Bulk Densit y ( D b ): The mass of dry soil (M s ) per unit bulk volume (V t ). D b = M s /V t V t = V s + V a + V w Air Soil Bulk S pecific Gravit y ( D sb ): The ratio of the D b of a soil to the mass of a unit volume of water ( D w ). D sb = D b / D w [NOTE: D w . 1 Mg/m 3 or 1,000 kg/m 3 ]
Image of page 2