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  2. Water retention curve - Wikipedia

    en.wikipedia.org/wiki/Water_retention_curve

    In 1907, Edgar Buckingham created the first water retention curve. [2] It was measured and made for six soils varying in texture from sand to clay. The data came from experiments made on soil columns 48 inch tall, where a constant water level maintained about 2 inches above the bottom through periodic addition of water from a side tube.

  3. Soil moisture - Wikipedia

    en.wikipedia.org/wiki/Soil_moisture

    The Global Climate Observing System specified soil water as one of the 50 Essential Climate Variables (ECVs). [18] Soil water can be measured in situ with soil moisture sensors or can be estimated at various scales and resolution: from local or wifi measures via sensors in the soil to satellite imagery that combines data capture and ...

  4. Atterberg limits - Wikipedia

    en.wikipedia.org/wiki/Atterberg_limits

    As the moisture content falls due to evaporation, the thread will begin to break apart at larger diameters. The plastic limit is defined as the gravimetric moisture content where the thread breaks apart at a diameter of 3.2 mm (about 1/8 inch). A soil is considered non-plastic if a thread cannot be rolled out down to 3.2 mm at any moisture ...

  5. Physical properties of soil - Wikipedia

    en.wikipedia.org/wiki/Physical_properties_of_soil

    The specific heat of soil increases as water content increases, since the heat capacity of water is greater than that of dry soil. [89] The specific heat of pure water is ~ 1 calorie per gram, the specific heat of dry soil is ~ 0.2 calories per gram, hence, the specific heat of wet soil is ~ 0.2 to 1 calories per gram (0.8 to 4.2 kJ per ...

  6. Soil Moisture Active Passive - Wikipedia

    en.wikipedia.org/wiki/Soil_Moisture_Active_Passive

    Soil Moisture Active Passive (SMAP) is a NASA environmental monitoring satellite that measures soil moisture across the planet. It is designed to collect a global 'snapshot' of soil moisture every 2 to 3 days. With this frequency, changes from specific storms can be measured while also assessing impacts across seasons of the year. [5]

  7. Soil mechanics - Wikipedia

    en.wikipedia.org/wiki/Soil_mechanics

    The Plastic Limit is the water content at which the soil behavior transitions from that of a plastic solid to a brittle solid. The Shrinkage Limit corresponds to a water content below which the soil will not shrink as it dries. The consistency of fine grained soil varies in proportional to the water content in a soil.

  8. Soil moisture sensor - Wikipedia

    en.wikipedia.org/wiki/Soil_moisture_sensor

    A simple soil moisture sensor for gardeners. Soil moisture sensors measure the volumetric water content in soil. [1] Since the direct gravimetric measurement of free soil moisture requires removing, drying, and weighing of a sample, soil moisture sensors measure the volumetric water content indirectly by using some other property of the soil, such as electrical resistance, dielectric constant ...

  9. Palmer drought index - Wikipedia

    en.wikipedia.org/wiki/Palmer_drought_index

    The index uses precipitation and temperature data to study moisture supply and demand using a simple water balance model. [ 1 ] [ 2 ] [ 3 ] It was developed by meteorologist Wayne Palmer, who first published his method in the 1965 paper Meteorological Drought [ 4 ] for the Office of Climatology of the U.S. Weather Bureau .

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