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Development of HYMO for Operational Forecasting.

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Final rept. Mar 85-Mar 87,

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A West German catchment the River Haune, has been established as a validation base for HYMO 2. On this catchment, an initial study has been completed of the relative effects of many storms on resultant catchment outflow hydrographs. This study is an essential element of the modeldata development programme. We aim to specify the precipitation input needs in time and space for selected applications of HYMO 2 within the next twelve months. An initial study of an approach to land use incorporation into the infiltration algorithm using organic matter change has revealed a relative insensitivity to this parameter. To apply HYMO 2 to forested conditions may necessitate further exploration-most probably in the modification of the hydraulic conductivity under such conditions. It is to be noted that validation of our scheme so far has been confined to non-forested areas see report DAJA-45-83-C-0029. We plan to rectify this within the next twelve months. The current treatment in HYMO 2 of rating-curve generation using the standard Manning equation has been examined. It is considered that the current approach may lead to errors in both peak flow and flood inundation estimates. An examination of alternative methods of estimating area and wetted perimeters in compound channels will be examined in the context of the Fulda catchment in the next reporting period.

Subject Categories:

  • Hydrology, Limnology and Potamology

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