Comprehensive risk assessment of groundwater drawdown induced subsidence
Journal article, 2019

We present a method for risk assessment of groundwater drawdown induced land subsidence when planning for sub-surface infrastructure. Since groundwater drawdown and related subsidence can occur at large distances from the points of inflow, the large spatial extent often implies heterogeneous geological conditions that cannot be described in complete detail. This calls for estimation of uncertainties in all components of the cause-effect chain with probabilistic methods. In this study, we couple four probabilistic methods into a comprehensive model for economic risk quantification: a geostatistical soil-stratification model, an inverse calibrated groundwater model, an elasto-plastic subsidence model, and a model describing the resulting damages and costs on individual buildings and constructions. Groundwater head measurements, hydraulic tests, statistical analyses of stratification and soil properties and an inventory of buildings are inputs to the models. In the coupled method, different design alternatives for risk reduction measures are evaluated. Integration of probabilities and damage costs result in an economic risk estimate for each alternative. Compared with the risk for a reference alternative, the best prior alternative is identified as the alternative with the highest expected net benefit. The results include spatial probabilistic risk estimates for each alternative where areas with significant risk are distinguished from low-risk areas. The efficiency and usefulness of this modelling approach as a tool for communication to stakeholders, decision support for prioritization of risk reducing measures, and identification of the need for further investigations and monitoring are demonstrated with a case study of a planned railway tunnel in Varberg, Sweden.

subsidence

infrastructure planning

cost-benefit analysis

risk assessment

groundwater drawdown

Author

Jonas Sundell

Chalmers, Architecture and Civil Engineering, GeoEngineering

Ezra Haaf

University of Gothenburg

Johannes Tornborg

Chalmers, Architecture and Civil Engineering, GeoEngineering

Lars Rosen

Chalmers, Architecture and Civil Engineering, GeoEngineering

Stochastic Environmental Research and Risk Assessment

1436-3240 (ISSN) 1436-3259 (eISSN)

Vol. 33 2 427-449

Risk management of groundwater drawdowns in subsidence sensitive areas: Cost-benefit analysis of safety measures in infrastructure projects

Formas, 2012-01-01 -- 2017-12-31.

Riskhantering vid grundvattensänkning i Varbergstunneln

Swedish Transport Administration, 2017-06-07 -- 2018-12-31.

Driving Forces

Sustainable development

Areas of Advance

Building Futures (2010-2018)

Subject Categories

Transport Systems and Logistics

Other Civil Engineering

Probability Theory and Statistics

DOI

10.1007/s00477-018-01647-x

More information

Latest update

4/29/2019