Shallow Slope Stability (SHALSTAB)

Definition

Shallow Slope Stability (SHALSTAB) is a specialized GIS-based hydrological model used to assess slope stability by analyzing terrain and hydrological factors that contribute to the risk of shallow landslides. This model integrates geomorphological and hydrological principles to identify areas where high pore water pressure may lead to slope failure. By utilising topographic and hydrological data, SHALSTAB computes critical threshold values, enabling the prediction and management of landslide-prone areas, which is crucial for land use planning and disaster risk reduction.

What is Shallow Slope Stability (SHALSTAB)?

Shallow Slope Stability (SHALSTAB) pertains to the evaluation of stability on slopes influenced by shallow groundwater recharge and associated hydrological processes. It operates within a GIS framework to map and simulate potential zones where slopes may fail due to saturated soil conditions resulting from high groundwater levels. Specifically, SHALSTAB computes grid cells across a landscape that exhibit critical values indicative of shallow groundwater recharge. These computations are derived from topographic slope, soil hydraulic properties, and rainfall patterns. By identifying these critical grid cells, SHALSTAB helps in the assessment of areas at risk of shallow landsliding, providing vital information for watershed management, infrastructure development, and the protection of human lives and properties from natural hazards.

FAQs

How does SHALSTAB determine critical grid cells for groundwater recharge?

SHALSTAB determines critical grid cells by analyzing topographic data, soil properties, and hydrological factors to identify locations where the subsurface water pressure reaches a threshold that can lead to instability. It uses algorithms to evaluate the potential for high pore water pressure within the soil, which may trigger landslides.

What data is required to run the SHALSTAB model?

The SHALSTAB model requires detailed topographic data, usually in the form of a digital elevation model (DEM), soil hydraulic properties, land cover data, and meteorological data such as rainfall intensity and distribution. These inputs are crucial for calculating the potential shallow groundwater recharge and assessing slope stability.

Who can benefit from using SHALSTAB?

Urban planners, engineers, watershed managers, and environmental scientists can benefit from using SHALSTAB. It is particularly useful for those involved in land use planning, disaster risk management, infrastructure development in hilly terrains, and environmental conservation efforts.

Can SHALSTAB be used in any geographical location?

While SHALSTAB is a versatile tool suitable for various terrains, its accuracy and effectiveness depend on the availability and quality of local data, such as detailed topographic maps and region-specific soil and hydrological data. It is primarily effective in areas prone to shallow landslides due to climatic and geological conditions.