gradP

Revised elevation gradient for Precipitation

When simulating in RS MINERVE, precipitation and temperature intensities are interpolated from the nearest stations using either Thiessen Polygons (nearest point) or the Shepard method, also known as the Inverse distance weighting method.

In the process of interpolation, a vertical gradient can be also used. For temperature, it is an additive term, whereas for precipitation it is a multiplicative coefficient.

By default for precipitation, it is set to 0 (no gradient).  As from the version 2.5.5.0, available as Beta since June 23rd 2017 and officially released on July 17th 2017, the unit of this gradient has been modified. The gradient of precipitation is newly expressed in [1/m], corresponding to percentage of increase/decrease per meter.

In addition, the gradient for the Potential Evapotranspiration has been also redefined in the same way.

Example : if the user wants to increase the precipitation by 20 per cent for each 1000 meters of altitude, the coefficient is equal to (20/100)/1000 = 0.0002.

The Technical manual of RS MINERVE has been consequently updated .