Evaluating Rapid Data Acquisition Methods for Structural Analysis of a Church at Risk from Climate Change Induced Subsidence

Abstract. The cost and time required for adequate data capture for structural analysis can be prohibitive and yet the advent of climate change induced impacts suggest demand will increase. Subsidence cases in the UK are rising, with climate change increasing risks, particularly in areas with shrinkable ground such as London clay. Heritage sites are especially vulnerable, and a lack of precedent for their three-dimensional digital structural analysis slows the development of conservation measures. This project focuses on a red brick Gothic Revival church; St John the Evangelist, in Upper Norwood, London, a Grade II* Listed building on London clay, which is currently facing subsidence due to soil expansion and shrinkage. This project aims to test the readiness of rapid data acquisition techniques in support of structural analysis. Using 3d data derived from both static and kinematic terrestrial laser scanning as well as aerial photogrammetry, a physical-based model will be developed in collaboration with LUSAS which kindly supported this project allowing the use of their in-house software. The adequacy of the data capture methods will be compared in order to support analysis of the causes and extent of structural movement. The aim is to develop this as a pilot project to aid stakeholders in creating adaptation plans for future conservation in response to climate change. The project aims to promote using rapid mapping tools that could become more readily available through research infrastructure hubs.