Elementor #8597

Latest news of the HYPE code (contribution by Dr. Charlotta Pers)

Observations and result time series as netcdf files

Introduction of forcing data and other observations to HYPE in the form of netcdf files was a long awaited improvement of the HYPE code last year. Each netCDF file contains one variable. Other observations than forcing data are named after the variable HYPE ID. Results in the form of time series of all subbasins are available in netcdf format, similar to the time output. The required format of the files and variables are specified on the HYPE wiki (HYPE netcdf standard, link: http://www.smhi.net/hype/wiki/doku.php?id=start:hype_netcdf_standard). User defined global attributes may be set to be added to the result files.

Other file related changes

The AssimInfo.txt file, which controls a simulation with data assimilation, has moved to the same location as the info.txt file. Options to specify location of other observations files, separate from forcing files, were introduced. At the same time, the default location of these files was moved to the forcingdir.

Observation data files with date in integer form, so called matlabformat, are now handled automatically. It is now possible to specify the format of the date in the result files in more detail, i.e., in integer form or with hyphen, and with or without the time.

The CropData file now needs an additional column specifying irrigation crops. This change was introduced to handle flexible irrigation periods depending on the actual temperature, which is a new feature.

Regarding HYPE output, the subbasin assessment has been extended. Statefiles are now possible to be written at regular intervals, e.g. once per year, and in an unformatted form to save disk space.

Lake changes

The Hysteretic Depressions Storage (HDS) model (Ahmed et al. 2023) is now included in HYPE. The HDS model simulates non-contributing areas for Canadian prairie potholes, developed together by colleagues from the University of Calgary (Canada) and SMHI. The HDS model serves as an alternative model for internal lakes in HYPE. The HDS model simulates the change in contributing catchment area, depressional storage and outflow from a subbasin.

In addition, minor improvements have been introduced related to lakes during the year. A minimum required flow can be easily specified for the outflow of a lake or dam. Earlier the production flow of the regulation routine could be used for this, but now these two methods can be used separate or together. Flushing options for sediment collected in reservoirs formed by multibasin lakes have been expanded as well.

Reference:

Ahmed, M.I., Shook, K., Pietroniro, A., Stadnyk, T., Pomeroy, J.W., Pers, C., Gustafsson, D., 2023. Implementing A Parsimonious Variable Contributing Area Algorithm for the Prairie Pothole Region in the HYPE Modelling Framework. Environmental Modelling & Software. https://doi.org/10.1016/j.envsoft.2023.105769