Damage Risk Index (DRI): Mathematical Definition, Computational Model, and Quantitative Application Using Environmental Sensor Data

This section introduces the Damage Risk Index (DRI), a synthetic indicator designed to quantify the probability of material decay in heritage structures based on microclimatic stressors. The DRI integrates normalized relative humidity, surface moisture, and short-term temperature fluctuations into a weighted composite score, reflecting their empirical contribution to deterioration processes. A logistic regression model is applied to translate the DRI into a probabilistic estimate of decay risk. A worked example using real sensor data illustrates the full computational workflow, including normalization, index calculation, and probability mapping. This framework supports predictive conservation strategies by enabling continuous, data-driven risk assessment across monitored heritage assets.