I am interested in learning about practical methods to reduce the effect of local katabatic flow of air in making low lying areas cooler and more susceptible to frost. There are many references that cold air can be trapped in low lying areas and that landforms, hedges, windbreaks, embankments etc can affect the flow of cold air and hence the frost effect.
Most advice seems to be along the lines of "don't plant frost tender crops in hollows" or "plant in hollows later in the spring". Well if you have a property that has low areas there is no point in wishing it wasn't that way - you need to make the best of what you have.
Can anybody give me a reference to practical advice on how to use hedges, windbreaks etc to reduce the effect, by directing the cold flow away from the garden or crop?
Specificaly I am interested in how to diagnose the situation, to be able to find out to what extent cold air flow is affecting frost intensity on my property and secondly, if this is happening, how to go about reducing the problem where possible.
David