Abstract:The microflow environments of aquatic plants with reference to Myriophyllum and Hydrilla are simulated in a laboratory flume. A Nix Streamflow microflow meter was used to measure the mean velocity profiles of flow at different densities of plants, flow ranges and measurement positions. Each mean velocity profile consists of three hydrodynamic regimes (i.e. within-canopy zone, above-canopy zone and a transitional zone between them), which indicate the presence of two benthic boundary layers (internal and external ones). Out of 38 measured mean velocity profiles, most do not fit a logarithmic relationship. The following hydrodynamic parameters are used in characterizing the flow regimes: local shear velocity (u Ł ), roughness length (z o ), canopy roughness Reynolds number (Re Ł ), bed shear stress ( o ) and laminar sublayer ( ).
The behaviour of 344 unsedated children in the anaesthetic room was assessed using a method similar to that described by Doughty (1959). The influence of the experience of the anaesthetist was found to be unimportant. The influence of the child's age was studied; children aged 7 yr and more behaved in a more satisfactory manner. The frequency of satisfactory behaviour compared favourably with that in published trials of sedative premedication which have used this method of assessment. The results support the view that the inclusion of unsedated children in such behavioural studies is essential.
Annual flow records, monthly flow records, peak and low flow records were used to derive an objective hydrological regionalization for 77 Tasmanian rivers. Twelve hydrological indices were determined, and the 12 × 77 matrix was analysed using principal coordinates analysis and complete linkage cluster analysis. Four groups were determined for Tasmania, with the south‐east region of the island exhibiting hydrological regimes similar to those of the drier areas of mainland Australia. The wettest areas, in the south and west, have regimes with no analogue elsewhere within mainland Australia. Significant least‐squares relationships between the variables enables catchment area, mean annual runoff and coefficient of variation of annual flows to be used to extrapolate other hydrological indices.
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