SATURN'S MOON TITAN IS ONE OF ONLY THREE BODIES IN THE SOLAR SYSTEM THAT POSSESS OR HAVE POSSESSED ACTIVE HYDROLOGICAL CYCLES. AS ON EARTH AND EARLY MARS THIS CYCLE LIKELY INCLUDES ATMOSPHERIC SURFACE AND SUBSURFACE COMPONENTS. THE PROPOSED RESEARCH ADDRESSES THE INTER-RELATION BETWEEN THESE DIFFERENT COMPONENTS OF THE HYDROLOGY OF TITAN WITH A FOCUS ON SUBSURFACE LIQUID ALKANE TRANSPORT. SAR IMAGES AND NEWLY GENERATED SAR-DERIVED TOPOGRAPHY WILL BE USED TO CHARACTERIZE AND CATALOG SURFACE FEATURES OF HYDROLOGICAL ORIGIN INCLUDING LAKES CHANNELS SEEPS OUTFLOWS AND PLAYAS. THE ORIGIN OF THESE FEATURES AND THE NATURE OF THE HYDROLOGICAL CYCLE WILL THEN BE INVESTIGATED USING A COMBINATION OF A TITAN GCM AND A MODEL OF THE SUBSURFACE HYDROLOGY. GCM SIMULATIONS WILL BE USED TO CONSTRAIN THE SPATIAL AND TEMPORAL REDISTRIBUTION OF LIQUID METHANE THROUGH PRECIPITATION AND EVAPORATION AT THE SURFACE TO BE USED AS A BOUNDARY CONDITION IN THE SUBSURFACE HYDROLOGY MODELS. THE HYDROLOGY MODELS WILL THEN INVESTIGATE THE SUBSURFACE METHANE TRANSPORT DRIVEN BY A COMBINATION OF THE ATMOSPHERIC REDISTRIBUTION OF METHANE FROM THE GCM AND THE HYDRAULIC GRADIENTS RESULTING FROM THE SURFACE TOPOGRAPHY. THESE MODELS WILL BE USED TO INVESTIGATE THE SEASONAL STABILITY OF LAKES THE OBSERVED CONCENTRATION OF LAKES IN THE NORTHERN ARCTIC REGION AND THE GENESIS OF OTHER FEATURES OF HYDROLOGIC ORIGIN.