Implementing the Water, HEat and Transport model in GEOframe (WHETGEO-1D v.1.0): algorithms, informatics, design patterns, open science features, and 1D deployment

Abstract. This paper presents WHETGEO and its 1D deployment: a new physically based model simulating the water energy budgets in soil column. The purpose of this contribution is twofold. First, we discuss mathematical numerical issues involved solving Richardson–Richards equation, conventionally known as Richards heat equation heterogeneous soils. In particular, for (R2) take advantage nested Newton–Casulli–Zanolli (NCZ) algorithm that ensures convergence solution any condition. Second, starting from modelling needs, present design software intended to be first building block customizable land-surface integrated with process-based hydrology. developed an open-source code, adopting object-oriented paradigm generic programming approach order improve usability expandability. fully into GEOframe/OMS3 system, allowing use many ancillary tools it provides. Finally, deployment WHETGEO, WHETGEO-1D, which has been tested against available analytical solutions presented Appendix.