Читать книгу Monument Future - Siegfried Siegesmund - Страница 18

The decision for conservation measures on marble or sandstone sculptures is usually made after a dialogue between the owner, heritage conservators, restorers and external experts weighing arguments and determining procedures. In oral and written presentations, the involved parties use expressions about the state of conservation and expected damage progress such as the sculpture is “very/at the highest” at risk, the marble weathered to a “low/medium/highest” degree, the surface of the sculpture is “little/hardly/strongly” affected threatening a loss of “significant/irreplaceable” artistic details. Although these evaluations derive from exact observations and measurements, they are nevertheless highly influenced by the individual and subjective estimation of the rapporteurs. As a result, decisions taken are difficult to retrace later on.

Considering this precondition, the Risk Number concept aims at developing a calculation method on a metrological and objective basis to record the condition and degree of endangerment for an outdoor sculpture. All observations and measured values recorded on an object and its environment are contained in one single figure, the Risk Number.

The concept of assessing the damage risk of historical objects is not completely new. Similar approaches regarding risk evaluation were reported by WAENTIG 2014; DELGADO RODRIGUES & GROSSI 2004; 2007; REVEZ 2010. These authors, however, did not scale the calculated risk to the limits Zero and One because the calculated risk is not easy to rate.