HydroGeoSphere/Elevation Instructions

These instructions are used to define 3-D mesh base elevations and new layer top elevations. Elevation constant elev Elevation value [L]. • • • Elevation from gms file basefile Name of the data file containing the elevation values for each node in the 2-D grid. This is a string variable. The file should be formatted as outlined in Section F.2. • • • Elevation from gb file basefile Name of the data file containing the base elevation values for each node in the 2-D grid. This is a string variable. The file should be formatted as outlined in Section G.2. • • • Elevation from raster file rasterfile Name of the raster file containing the base elevation values. This is a string variable. The file should be formatted as outlined in Section H. • • • Elevation from bilinear function in xy xfrom, xto, yfrom, yto x- and y-ranges. a1,a2,a3,a4,a5 Constants for bilinear function. For nodes falling within the given x- and y-range, the z-coordinate is computed according to the following function: • • • Elevation from sine function in xy xfrom, xto, yfrom, yto x and y ranges. zz0 Elevation at xfrom, yfrom. num_sw_x,amplitude_x,slope_x Number of sine wave cycles, sine wave amplitude and surface slope in the x−direction. num_sw_y,amplitude_y,slope_y As above but in the y−direction. For nodes falling within the given x- and y-range, the z-coordinate is computed according to the following function: where: • • • The number of cycles of the sine wave can be a fraction and the sine function rises from a value of at as x- and y-values increase. Where the peaks coincide, the maximum elevation is the sum of . Elevation from cosine function in xy As above but uses the cosine function instead of the sine function. • • • Elevation from xz pairs xval, zval xz-pair 1. xval, zval xz-pair 2. ...etc... xval, zval xz-pair n. end Signals end of list. Listed xz-coordinate pairs are read until an End instruction is encountered. They should be given in order from smallest to largest x. For each node in the 2-D grid, the x-coordinate of the node is used to determine its position in the list, and a z-coordinate is then interpolated from the neighbouring xz-pairs. • • •