1. When editing the source code, always work on the .F files, otherwise changes will be lost on the next compilation.
2. In the .F files, it is possible to include `#ifdef` and `#ifndef` directives for conditional compilation.
For instance, in `dyn_em/module_initialize_ideal.F`, the following bits of code define the model orography for idealized large-eddy simulation runs. Four possibilities are given: `MTN`, `EW_RIDGE`, `NS_RIDGE`, and `NS_VALLEY`. If none is selected at compile time, none of these code lines is compiled and `grid%ht(i,j)` (the model orography) is set to 0:
For instance, in `dyn_em/module_initialize_ideal.F`, the following bits of code define the model orography for idealized large-eddy simulation runs. Four possibilities are given: `MTN`, `EW_RIDGE`, `NS_RIDGE`, and `NS_VALLEY`. If none is selected at compile time (select by adding `!` in front of #ifdef and #endif), none of these code lines is compiled and `grid%ht(i,j)` (the model orography) is set to 0:
