Dataset for Hydraulic Modeling of Newtonian and Non-Newtonian Debris Flows in an Alluvial Fan: Amoray Gully, Peruvian Andes
Description
This dataset supports the research article “Hydraulic Modeling of Newtonian and Non-Newtonian Debris Flows in Alluvial Fans: A Case Study in the Peruvian Andes”. It provides a complete and reproducible dataset for hydrological analysis, rheological characterization, and 2D hydraulic modeling of debris flows in the Amoray Gully watershed (Apurímac, Peru). The dataset is organized into four main folders: 1. Hydrology: This folder includes the HEC-HMS project files, watershed delineation data (QGIS), and processed rainfall datasets. It contains maximum 24-hour precipitation records (1996–2020) from SENAMHI stations (Andahuaylas, Tambobamba, and Chalhuanca), as well as design storm estimations for multiple return periods (2–500 years) and resulting hydrographs generated using the SCS-CN method. 2. Soil testing: This folder contains geotechnical field and laboratory data, including granulometric test results and soil classification (USCS) obtained from three test pits. These data were used to estimate rheological parameters such as yield stress and dynamic viscosity for non-Newtonian flow modeling. 3. Hydraulics: This folder includes the complete HEC-RAS 6.6 2D model, terrain data (high-resolution DEM derived from RTK drone photogrammetry), Manning roughness coefficients (shapefile), and projection files. It also contains simulation outputs for both Newtonian and non-Newtonian scenarios, including flow depth, velocity, and flood extent for different return periods. 4. Hydraulic design (HY-8): This folder provides the culvert design files generated in HY-8 software, including the .hy8 project file and supporting figures. The design corresponds to a multi-barrel circular culvert developed based on the 50-year return period discharge to mitigate debris flow impacts on road infrastructure. Hydraulic simulations were performed using HEC-RAS 6.6 in 2D mode, incorporating rheological parameters derived from empirical models and calibrated using field evidence from a debris flow event recorded in 2021 (INDECI reports). The dataset includes comparative results demonstrating differences between Newtonian and non-Newtonian approaches in terms of flow depth, velocity, and inundation extent. This dataset enables full reproducibility of the modeling workflow presented in the associated article and can be used for further research in debris flow modeling, hydrological analysis, and resilient hydraulic infrastructure design in mountainous environments.
Files
Steps to reproduce
1. Hydrological analysis: Open the HEC-HMS project located in the “Hydrology” folder. Review the watershed model, including basin parameters and Curve Number (CN = 85). Use the provided precipitation data (1996–2020) to generate design storms for selected return periods (e.g., 5, 50, and 100 years) using the alternating block method. Run the model to obtain hydrographs and peak discharges. 2. Terrain and spatial data preparation: Load the DEM and projection files from the “Hydraulics” folder into GIS software or HEC-RAS RAS Mapper. Verify the terrain resolution and coordinate system. Import the Manning roughness shapefile and assign roughness values according to land cover classification. 3. Hydraulic model setup: Open the HEC-RAS 6.6 project included in the “Hydraulics” folder. Load the computational mesh (5 × 5 m resolution), boundary conditions, and terrain model. Import the hydrographs generated from HEC-HMS as upstream boundary conditions. 4. Newtonian simulation: Run the hydraulic model under Newtonian assumptions (clear water flow). Record outputs such as maximum flow depth, velocity, and flood extent. 5. Non-Newtonian simulation: Modify the flow parameters by incorporating rheological properties (yield stress and dynamic viscosity) based on the values provided in the dataset (CV = 61–65.5%). Run the simulation using the non-Newtonian model available in HEC-RAS 6.6. 6. Model calibration: Compare simulated results with field evidence from the 2021 debris flow event (included in the dataset). Adjust flow parameters if necessary to match observed flow depths and spatial extent. 7. Results comparison: Analyze differences between Newtonian and non-Newtonian simulations in terms of flow depth, velocity, and inundation area. 8. Hydraulic design: Open the HY-8 project in the “Hydraulic design” folder. Review the culvert design based on the 50-year return period discharge. Modify parameters if needed to test alternative design scenarios.
Categories
Funders
- This research received no external funding.