At-A-Station Hydraulic Geometry Simulator

作者：McParland Daniel^*; Eaton Brett; Rosenfeld Jordan

来源：River Research and Applications, 2016, 32(3): 399-410.

DOI：10.1002/rra.2851

• river morphology
• aquatic habitat
• regime theory
• hydraulic geometry
• hydrodynamic modelling
• fluvial system

Presented in this paper is a hydraulic model that combines a rational regime theory with an at-a-station hydraulic geometry simulator (ASHGS) to predict reach-averaged hydraulic conditions for flows up to but not exceeding the bankfull stage. The hydraulic conditions determined by ASHGS can be paired with an empirical joint frequency distribution equation and applicable habitat suitability indices to generate weighted usable area (WUA) as a function of flow. ASHGS was tested against a 2-dimensional hydrodynamic model (River2D) of a mid-size channel in the Interior Region of British Columbia. By linking ASHGS to a regime model, it becomes possible to evaluate the direction and magnitude of habitat changes associated with a wide range of environmental changes. Our regime model considers flow regime, sediment supply, and riparian vegetation: these governing variables can be used to simulate responses to forest fire, flow regulation and changes in climate and land use. Practitioners can examine what-if' scenarios that otherwise would be too expensive and time consuming to fully explore. The model boundaries of commonly used data-intensive hydraulic habitat models (e.g. PHABSIM) are not easily adjusted and such models are not designed to estimate future morphological and hydraulic habitat conditions in rivers the undergo significant channel restructuring. The proposed model has the potential to become an accepted flow assessment tool amongst practitioners due to modest data requirements, user-friendliness, and large spatial applicability; it can be used to conduct preliminary assessments of channel altering projects and determine if in-depth habitat assessments are justified.

• 出版日期2016-3