Restructuring of USACE HEC-HMS Meteorologic Model

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Significant modifications have been made to the HEC-HMS meteorologic model to enhance modeling tasks' ease and intuitiveness. The Met Model Restructure updates in versions 4.9 to 4.11 streamline meteorologic processes, introduce new features like automatic linkages and zonal editors for snowmelt, and emphasize basin-meteorology linking and de-coupling computations. The webinar series covers an overview of the restructured model, demos of features like interpolated meteorology, snow migration, and zonal editors, and explains the process generalization and basin-meteorology linking in detail.

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Met Model Restructure USACE HEC-HMS CoP Webinar Series December 2022 Thomas Brauer, P.E. David Ho, P.H. Mike Bartles, P.E. Daniel Black

Summary The HEC-HMS meteorologic model has undergone significant modification to make certain modeling tasks easier and more intuitive The effort is known amongst the HEC-HMS team as the "Met Model Restructure." HEC-HMS v4.9 through v4.11 include Met Model Restructure updates

Outline 1. Met Model Restructure Overview 2. Demo of Interpolated Meteorology 3. Demo of Snow Migration 4. Demo of Snow Zonal Editors

Met Model Restructure Version Feature v4.9 Meteorologic processes generalized v4.9 Meteorologic model and basin model computes de-coupled v4.9 v4.10 Automatic linkages for a gridded met model Interpolation methods added for all meteorologic processes v4.10 Snow methods migrated to the basin model v4.11 Zonal editors for snowmelt introduced

Process Generalization v4.9 and newer Pre v4.9 Every process its own method First-order processes on subbasin node

Basin-Meteorology Linking Requires subbasin-level parameters Gridded methods do not require subbasin-level parameters Tab Included No tab

Compute De-coupling Met Model Time Step 1 2 3 4 5 6 7 8 n 1 2 3 4 5 6 7 8 n Pre v4.9 Basin Model Cached Met Model Met Model 1 2 3 4 5 6 7 8 n Time Step 1 2 3 4 5 6 7 8 n v4.9 and newer 1 2 3 4 5 6 7 8 n Basin Model

Interpolated Meteorology New Meteorological method in 4.10 Interpolating point data within HMS Precipitation, Temperature, Windspeed, Dew Point Temperature, Evapotranspiration, Longwave Radiation Create gridded dataset for gridded domain or time series at point locations for non-gridded domains 8

Interpolated Meteorology Why is this useful? Estimate values at grids or points within a watershed following Tobler s first law Create historic gridded meteorology Visualize storms spatially and temporally Adjust values using a bias grid or lapse rate Define your own grid size Does not rely on external software (i.e. gageInterp) to generate gridded dataset 9

Interpolated Meteorology Meteorological Model Set up Ensure C-Part is PRECIP-INC Data type is PER-CUM Consistent Units Add time-series point data Include lat/long Elevation for Temperature gages Select a radius of influence 10

Interpolated Meteorology Four Interpolation Methods Inverse Distance Inverse Distance Squared Nearest Neighbor Bilinear Bias Grid for Precipitation Account for topography PRISM 30 yr normal/100yr Precip-Freq Grid Lapse Rate for Temperature i.e. -3 F/1000ft 11

Snow Migration Within v4.9 and earlier, snow methods were a part of the meteorologic model

Snow Migration Starting with v4.10, snow methods are a part of the basin model

Snow Migration Migration happens automatically Basin model/met model combinations that used snowmelt will result in basin model copies Simulation Runs, Forecast Alternatives, etc will update automatically

Snowmelt Zonal Editors Snowmelt zonal editors available for Temperature Index and Gridded Temperature Index

Snowmelt Zonal Editors Global values can be applied to all elements within a zone Override values can be applied to individual elements Quickly apply changes to one or more snowmelt parameters