TU Darmstadt / ULB / TUprints

A Systematic Analysis of the Interaction between Rain-on-Grid-Simulations and Spatial Resolution in 2D Hydrodynamic Modeling

David, Amrei ; Schmalz, Britta (2022)
A Systematic Analysis of the Interaction between Rain-on-Grid-Simulations and Spatial Resolution in 2D Hydrodynamic Modeling.
In: Water, 2022, 13 (17)
doi: 10.26083/tuprints-00022085
Article, Secondary publication, Publisher's Version

[img] Text
water-13-02346-v4.pdf
Copyright Information: CC BY 4.0 International - Creative Commons, Attribution.

Download (19MB)
Item Type: Article
Type of entry: Secondary publication
Title: A Systematic Analysis of the Interaction between Rain-on-Grid-Simulations and Spatial Resolution in 2D Hydrodynamic Modeling
Language: English
Date: 25 August 2022
Place of Publication: Darmstadt
Year of primary publication: 2022
Publisher: MDPI
Journal or Publication Title: Water
Volume of the journal: 13
Issue Number: 17
Collation: 43 Seiten
DOI: 10.26083/tuprints-00022085
Corresponding Links:
Origin: Secondary publication via sponsored Golden Open Access
Abstract:

A large number of 2D models were originally developed as 1D models for the calculation of water levels along the main course of a river. Due to their development as 2D distributed models, the majority have added precipitation as a source term. The models can now be used as quasi-2D hydrodynamic rainfall–runoff models (‘HDRRM’). Within the direct rainfall method (‘DRM’), there is an approach, referred to as ‘rain-on-grid’, in which input precipitation is applied to the entire catchment area. The study contains a systematic analysis of the model behavior of HEC-RAS (‘Hydrologic Engineering Center—River Analysis System’) with a special focus on spatial resolution. The rain-on-grid approach is applied in a small, ungauged, low-mountainrange study area (Messbach catchment, 2.13 km2 ) in Central Germany. Suitable model settings and recommendations on model discretization and parametrization are derived therefrom. The sensitivity analysis focuses on the influence of the mesh resolution’s interaction with the spatial resolution of the underlying terrain model (‘subgrid’). Furthermore, the sensitivity of the parameters interplaying with spatial resolution, like the height of the laminar depth, surface roughness, model specific filter-settings and the precipitation input-data temporal distribution, is analyzed. The results are evaluated against a high-resolution benchmark run, and further criteria, such as 1. Nash–Sutcliffe efficiency, 2. water-surface elevation, 3. flooded area, 4. volume deficit, 5. volume balance and 6. computational time. The investigation showed that, based on the chosen criteria for this size and type of catchment, a mesh resolution between 3 m to 5 m, in combination with a DEM resolution from 0.25 m to 1 m, are recommendable. Furthermore, we show considerable scale effects on flooded areas for coarser meshing, due to low water levels in relation to topographic height.

Uncontrolled Keywords: hydrodynamic modeling; hydrological modeling; storm hazard analysis; Direct Rainfall Method; rain-on-grid; sensitivity analysis; overland flow; spatial resolution
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-220857
Classification DDC: 500 Science and mathematics > 550 Earth sciences and geology
600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 13 Department of Civil and Environmental Engineering Sciences > Institute of Hydraulic and Water Resources Engineering > Engineering Hydrology and Water Management
Date Deposited: 25 Aug 2022 12:08
Last Modified: 14 Nov 2023 19:05
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/22085
PPN: 498645118
Export:
Actions (login required)
View Item View Item