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The Indiana Department of Transportation (INDOT) is considering the deployment of fixed scour-monitoring instrumentation as part of a systematic response to the problem of scour around bridge piers. Within a larger study of the efficacy of and the problems to be encountered with such instrumentation, a project was undertaken in which two different types of scour monitoring devices were installed on piers at two different sites near Purdue University. The two devices, one based on a magnetic collar on a rod driven into the streambed, the other based on a sonar or acoustic principle, were developed with funding by the Federal Highway Administration and National Cooperative Highway Research Program, and their use is being actively promoted by these agencies. This report is divided into three main sections. First, in Chapter 2, the devices are described and their principles of operation are briefly outlined. Deviations from the standard configuration are highlighted. In Chapter 3, the installation procedure followed is described, and a report of the important events during the course of the field component of the project is given generally. The procedure for downloading the field data collected is briefly dealt with, together with a description of the format of the data collected. A sample of the data so far obtained forms the basis of the discussion in Chapter 4 of the performance of the scour monitoring devices. The important conclusions gained from the field study as well as the questions still open are summarized in Chapter 5. The devices do show promise as being effective for continuously monitoring the local scour around a bridge pier. The long-term survivability of the monitors in the Indiana stream environment, where woody debris is prevalent with no countermeasures taken, remains still to be proven.

A Field Study of Scour Monitoring Devices for Indiana Streams