10 votes
Accepted

What is hydraulic diffusivity?

So let's get through some definitions. I will not discuss the derivations of this, but you can look this up, if you want to in the source I provided. We find ourselves in a porous medium, so we will ...
6 votes
Accepted

What's a frost-gley?

A frost-gley is a waterlogged permafrost soil. IOW, a gleysol that has undergone cryoturbation.
  • 1,197
4 votes
Accepted

Is there a standard definition of a "dry-down" event in hydrology?

Dry down is mainly dependent on the speed where a local water storage would be depleted, considering those components extracted from the simplified water balance equation water input (precipitation) ...
  • 2,633
4 votes
Accepted

How to obtain the saturation point of a soil layer from the volumetric soil water content data?

I assume you mean sensors that measure volumetric soil water content. The answer will depend on the amount of precipitation and the permeability of the soil. Soils don't reach full saturation in some ...
  • 4,339
3 votes
Accepted

What is the difference between Water Holding Capacity, Field Capacity and TAWC?

Okay Water Holding Capacity(WHC) is how much water the soil has in it at total saturation, if you filled every soil pore space completely with water. Field Capacity(FC), if I remember correctly from ...
  • 4,225
3 votes

Transformation of soil moisture units

The other answers are correct that you need to know the soil depth to convert from mass units (kg m-2) to volumetric units (m3 m-3). However, when comparing these variables you should also be aware ...
  • 3,302
2 votes

Why is the soil between these olive trees left bare?

Bare soil is one of the worst things for erosion. Such soil contains no plant roots to help contain the soil and thus prevent erosion. Bare soil is also one of the worst things for water loss from ...
  • 21.9k
2 votes

Soil moisture conditions and air temperatures - literature needed

If you're after "basic" academic work, I suggest the following 2003 textbook from the Utah State University entitled, "Rainfall Runoff Processes", chapter 2: Runoff Generation Mechanisms It looks ...
2 votes
Accepted

How to convert soil moisture units from meteorological model?

Your method looks OK, however, water density varies with temperature. Not knowing exactly what your aim is or how accurate/fussy you want to be, you may want to consider using the density of water ...
  • 21.9k
2 votes
Accepted

How does SMAP detect soil statistics?

The SMAP includes both an active L-band synthetic aperture radar and a passive microwave radiometer. Any object above a temperature of absolute 0 will emit thermal radiation over a wide range of ...
1 vote

Difference between soil Water Holding Capacity and soil pore volume?

As Friddy says, if it's not constrained and relatively intact you're going to have issues with pore volume calculations. Generally the saturate-and-dry method, using a soil core, will give you both ...
1 vote
Accepted

How much excess water prevents planting of a crop

In practice you really don't want to plant a field that is even close to capacity. Doing so will result in ruts, soil compaction, breakdown of soil structure and a large increase in fuel consumption. ...

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