HR: 08:55h
AN: H41B-02    [Abstracts]
TI: Spatial and Temporal Linkages Related to Hydrogeomorphic Processes: an Emerging Discipline
AU: * Sidle, R C
EM: sidle@slope.dpri.kyoto-u.ac.jp
AF: Geohazards Division, DPRI, Kyoto University, Gokasho, Uji, Kyoto, 611-0011 Japan
AB: Hydrologic and geomorphic processes are intrinsically linked related to such fundamental catchment-scale processes as stormflow generation, sediment production and routing, and nutrient cycling. The emerging discipline of hydrogeomorphology focuses on these process linkages in both time and space. Many attempts to quantify and model hydrogeomorphic processes across various temporal and spatial scales have been unsatisfactory due to a poor understanding of processes linkages. From a practical viewpoint, models that yield the correct hydrogeomorphic response at the small catchment scale (5-20 ha) are often considered to accurately represent internal hydrogeomorphic processes. Nevertheless, even at this small scale, various hydrogeomorphic processes could produce similar responses. Understanding the pathways of water and sediment from the hillslope to the stream, and subsequently within stream systems is essential to evaluate effects of land use. Many of the hydrologic and sediment models that have attempted to incorporate processes still greatly simplify the complexity of hydrogeomorphic pathways. To understand the movement of sediments and water from source to sink, it is necessary to link hydrologic processes with their respective geomorphic settings and vice versa. For stormflow processes, the hydrogeomorphic paradigm of stormflow generation is proposed, whereby catchments are partitioned into landform attributes (riparian corridors, hillslopes, hollows) based on their unique hydrologic response. Sediment pathways are more obvious than hydrologic pathways, but are still poorly understood. Dynamic sediment budgets that include temporally and spatially explicit estimates of sediment sources and sediment routing (affected by hydrology) and linkages (influenced by land practices) are useful to assess the complex internal hydrogeomorphic processes that affect sediment and related nutrient fluxes.
DE: 1800 HYDROLOGY
DE: 1815 Erosion and sedimentation
DE: 1845 Limnology
DE: 1866 Soil moisture
SC: Hydrology [H]
MN: 2005 Joint Assembly