Web-Based Database Of Integrated Geophysical Method For Levee Safety Assessment

In order to evaluate the safety of levees based on an integrated geophysical method, a web-based database containing results of the integrated geophysical method, boring logs and levee safety assessment records was constructed. We collected the results of surface wave methods and resistivity methods performed at 37 Japanese rivers as well as the results of borings conducted on survey lines of geophysical methods. A land streamer and a capacitively-coupled resistivity method were generally used in the data acquisition of the surface wave methods and the resistivity methods, respectively. Analyzed results were saved as a standard XML format defined by The Society of Exploration Geophysicists of Japan. The web-based database consists of four parts: A) a database of the geophysical investigation results, B) a database of levee safety assessment and maintenance records, C) a database of blow counts (N-value), soil type, S-wave velocity (Vs) and resistivity, and D) a database of Vs, resistivity and laboratory tests. Data registered for the database is as follows: length of about 650 km of geophysical investigation results, about 400 boring logs, about 4,000 relationships of Vs, resistivity, N-value and soil type, about 1,000 relationships of Vs, resistivity and laboratory tests, 340 km of levee safety assessment and maintenance records. The database was constructed on a web server using MySQL and PHP so that users access to the database through the internet. This paper presents an outline of the database, an example of data, and an application example of the database and proposes a management framework of the database in the future.