William C. Harrell

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1. Despite progress in the development of conceptual models of river processes, the validation and application of these models to conservation may be limited by a deficit of tools for intermediate-scale (1–100 km) reaches. A model was developed to examine the effect of variation in flow on the responses of two trophic levels in a large temperate river(More)
The Yolo Bypass, a large, managed floodplain that discharges to the headwaters of the San Francisco Estuary, was studied before, during, and after a single, month-long inundation by the Sacramento River in winter and spring 2000. The primary objective was to identify hydrologic conditions and other factors that enhance production of phytoplankton biomass in(More)
—The splittail Pogonichthys macrolepidotus, which has been listed as threatened by the U.S. government, does not produce strong year-classes unless it has access to the floodplain habitat of the San Francisco estuary and its tributaries. In this small-scale, singleyear study, we tested the hypothesis that managed inundation of a floodplain can be used to(More)
Where tributaries meet, certain conditions of flow and topography often result in incomplete mixing and the formation of spatially and temporally persistent plumes or bands. Yolo Bypass, the primary floodplain of the lower Sacramento River (California, USA), provides an extreme example of this effect. Inspection of recent and historical aerial photographs(More)
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