Stormflow generation in steep forested headwaters: a linked hydrogeomorphic paradigm
Corresponding Author
Roy C. Sidle
Departments of Forest Resources Management and Geography, University of British Columbia, 2424 Main Mall, 2nd floor, Vancouver, British Columbia, V6T 1Z4, Canada
Departments of Forest Resources Management and Geography, University of British Columbia, 2424 Main Mall, 2nd Floor, Vancouver BC V6T 1Z4, Canada.===Search for more papers by this authorYoshio Tsuboyama
Forestry and Forest Products Research Institute, P.O. Box 16, Tsukuba Norin Kenkyu, Ibaraki 305-8687, Japan
Search for more papers by this authorShoji Noguchi
Forestry and Forest Products Research Institute, P.O. Box 16, Tsukuba Norin Kenkyu, Ibaraki 305-8687, Japan
Search for more papers by this authorIkuhiro Hosoda
Tohoku Research Center, Forestry and Forest Products Research Institute, Morioka 020-0123, Japan
Search for more papers by this authorMotohisa Fujieda
Forestry and Forest Products Research Institute, P.O. Box 16, Tsukuba Norin Kenkyu, Ibaraki 305-8687, Japan
Search for more papers by this authorToshio Shimizu
Forestry and Forest Products Research Institute, P.O. Box 16, Tsukuba Norin Kenkyu, Ibaraki 305-8687, Japan
Search for more papers by this authorCorresponding Author
Roy C. Sidle
Departments of Forest Resources Management and Geography, University of British Columbia, 2424 Main Mall, 2nd floor, Vancouver, British Columbia, V6T 1Z4, Canada
Departments of Forest Resources Management and Geography, University of British Columbia, 2424 Main Mall, 2nd Floor, Vancouver BC V6T 1Z4, Canada.===Search for more papers by this authorYoshio Tsuboyama
Forestry and Forest Products Research Institute, P.O. Box 16, Tsukuba Norin Kenkyu, Ibaraki 305-8687, Japan
Search for more papers by this authorShoji Noguchi
Forestry and Forest Products Research Institute, P.O. Box 16, Tsukuba Norin Kenkyu, Ibaraki 305-8687, Japan
Search for more papers by this authorIkuhiro Hosoda
Tohoku Research Center, Forestry and Forest Products Research Institute, Morioka 020-0123, Japan
Search for more papers by this authorMotohisa Fujieda
Forestry and Forest Products Research Institute, P.O. Box 16, Tsukuba Norin Kenkyu, Ibaraki 305-8687, Japan
Search for more papers by this authorToshio Shimizu
Forestry and Forest Products Research Institute, P.O. Box 16, Tsukuba Norin Kenkyu, Ibaraki 305-8687, Japan
Search for more papers by this authorAbstract
Headwater catchments are sources of sediments, nutrients, and biota for larger streams, yet the hydrologic pathways that transport these materials remain unclear. Dynamics of stormflow generation related to landform attributes and antecedent rainfall were investigated in a steep forested headwater catchment at Hitachi Ohta Experimental Watershed, Japan. Such headwater catchments are deeply incised: the narrow riparian corridors have limited capacities to store and transmit water to streams. Storm runoff was monitored at several nested scales within the catchment: (1) 2·48 ha first-order drainage (FB); (2) incipient 0·84 ha first-order drainage (FA) comprized of two zero-order basins; (3) 0·25 ha zero-order basin (ZB); and (4) 45 m2 hillslope segment (HS), including subsurface matrix flow (MF) and preferential flow (PF). Results from applied tracer and staining tests as well as observations of piezometric, tensiometric, and subsurface temperature responses were also employed to elucidate hydrologic pathways during storms. During the driest conditions, water yield from FB was only 1%; runoff occurred as saturated overland flow from the small riparian zone and direct channel interception. For slightly wetter conditions, subsurface flow from the soil matrix augmented stormflow. As wetness increased, two significant non-linear hydrologic responses occurred: (1) threshold response in geomorphic hollows (zero-order basins) where runoff initiated after an accumulation of shallow groundwater; and (2) self-organization and expansion of preferential flow pathways, which facilitate subsurface drainage. Stormflow increases observed during periods of increasing antecedent wetness depend upon temporal and spatial linkages and the unique hydrologic behavior of three components: (1) narrow riparian corridors; (2) linear hillslopes; and (3) geomorphic hollows. These linkages form the basis for an emerging hydrogeomorphic concept of stormflow generation for steep forested headwaters. Knowledge of stormflow response is critical to the assessment of management practices in these headwater areas as well as the routing of water and materials to larger stream systems. Copyright © 2000 John Wiley & Sons, Ltd.
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