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The role of landscape setting in minimizing hydrogeomorphic impacts of flow regulation

International Journal of Sediment Research 2013年第2期28卷 149-161页

作者： H.E.REID G.J.BRIERLEY K.MCFARLANE S.E.COLEMAN S.TROWSDALE School of Environment The University of Auckland Department of Civil and Environmental Engineering The University of Auckland

The Tongariro Power Development Scheme（TPDS） is used to regulate flow in the headwaters of the largest catchment on the North Island of New Zealand（the Waikato）.Two small dams,the Rangipo Dam and the Poutu Intake Dam,were constructed in 1973 and *** flow regime of the river is managed to divert freshes into the power scheme,but allows flows larger than 100 m;s;to be released,to rework and transport sediment through the catchment. Analysis of aerial photos and maps spanning 1928 to 2007,alongside field measurements,show that there have been few hydrogeomorphic adjustments since dam *** includes limited changes to channel geometry,channel planform and bed material organization immediately downstream of the *** addition,offsite effects are minimal, both 500 m downstream of each dam,and in the more sensitive,less confined reaches in the lower catchment（11 km downstream of the Poutu Intake dam）.The limited changes can be attributed to the locations of the dams within reaches characterised by bedrock gorges and confined within *** locations act to flush sediments and impose margins that allow minimal adjustment of the *** material within this reach is characterised by the presence of a boulder *** is sourced from long-term incision into lahar deposits,and acts to limit the rate of incision, creating a steep and stable base upon which active fractions are *** as importantly,significant storage in the low-relief volcanic plateau located in the upper catchment acts to disconnect and store the high sediment yields generated by active volcanic cones in the western sub-catchment upstream of the *** limits the rate of sediment supply to regulated *** from this study show that analysis of reach-scale controls is essential in framing dam site locations in relation to the distribution of reaches and landscape units across the *** this instance, tributary inputs downstream of the dams do not repl

关键词： Flow regulation landscape setting landscape connectivity Sediment storage Channel planform

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