Added description and figures for the katabtic flow comparisons

We added text and figures from our katabatic comparisons. The text is rather expansive, so feel free to pare it down to fit within the scope of the paper. A few items require attention. The katabtic comparison section was already 3 levels deep, but the style file limits "secnumdepth" to 3. I didn't want to modify that, so the numbering is off. Also, references are manually typed since the repository doesn't contain the bibliography file.