iHydroSlide3D v1.0: an advanced hydrological-geotechnical model for hydrological simulation and three-dimensional landslide prediction
Abstract. Forecasting flood–landslide cascading disasters in flood- and landslide-prone regions is an important topic within the scientific community. Existing hydrological-geotechnical models mainly employ infinite or static 3D stability model and very few models have incorporated the 3D landslide model into a distributed hydrological model. In this work, we modified a 3D landslide model to account for slope stability under various soil wetness states and then coupled it with the Coupled Routing and Excess STorage (CREST) distributed hydrology model, forming a new modelling system called iHydroSlide3D v1.0. The model features the feasibility of applying flexibly different simulating resolutions for hydrological and slope stability submodules by embedding a soil moisture downscaling method. For a large-scale application, we paralleled the code and elaborated several computational strategies. The model produces a relatively comprehensive and reliable diagnosis for flood-landslide events, including (i) complete hydrological components (e.g., soil moisture and streamflow), (ii) a landslide susceptibility assessment (factor of safety and probability of occurrence), and (iii) a landslide hazard analysis (geometric properties of potential failures). We evaluated the plausibility of the model by testing it in a large and complex geographical area, the Yuehe River Basin, China, where we attempted to reproduce cascading flood–landslide events. The results are well verified at both hydrological and geotechnical levels. iHydroSlide3D v1.0 is therefore appropriately used as an innovative tool for assessing and predicting cascading flood–landslide events once the model is well calibrated.
Guoding Chen et al.
Status: final response (author comments only)
RC1: 'Comment on gmd-2021-283', Anonymous Referee #1, 23 Feb 2022
- AC1: 'Reply on RC1', Ke Zhang, 07 Apr 2022
Guoding Chen et al.
Guoding Chen et al.
Viewed (geographical distribution)
Review of iHydroSlide3D v1.0: an advanced hydrological-geotechnical model for hydrological simulation and three-dimensional landslide prediction
The paper presents an algorithm that couples hydrological modelling and 3-D landslide prediction, and gives a good overview of why such a model is needed given what already exists in that field. The introduction provides a good review of the limitations associated with hydrological modelling and landslide prediction separately, and then how these two types of models can be combined to better represent mass movement. The model framework also provides a clear overview of the method and its underpinning equations. I am recommending this paper for publication with minor revisions. These revisions and suggestions for improvement are as follows:
Digital elevation model
Topographic wetness index
Land surface cover
Percentage impervious area
Saturated hydraulic conductivity
Available water capacity
Exponent of the infiltration curve
Results and discussion
I tested the code available on Zenodo. The included manual is great to show a step-by-step of what needs to be done. It was relatively easy to get it up and running, but I ran into some errors in MATLAB because I had not installed some toolboxes (e.g. Mapping Toolbox, Parallel Computing Toolbox, Curve Fitting Toolbox). It would be good if the manual included the list of Toolbox dependencies in case the user has a limited installation of MATLAB.
Once the Toolboxes were installed, I was able to run the code without errors. I wasn’t sure how to interpret the datasets in the Results section, and it would be good if the manual could give a brief rundown on what the results represent. The accompanying text files (Outlet_Results, Outpix_03501000_Results, Outpix_03501000_Results_Statistics) were also empty.