The following technical report is available from http://aib.informatik.rwth-aachen.de: Sensitivity Analysis in Sisyphe with the AD-Enabled NAGWare Fortran Compiler Uwe Naumann, Jan Riehme AIB 2008-04 We present the final report for a collaborative research project with the Federal Waterways Engineering and Research Institute, Karsruhle. A numerical model of a dune implemented in Sisyphe is considered. Sensitivity analysis is performed using a tangent-linear model that is generated automatically by the differentiation-enabled NAGWare Fortran compiler.