NUMERICAL ANALYSIS OF INUNDATION PROCESS OF UNDERGROUND SPACE IN URBAN AREA DUE TO THE HEAVY RAINFALL TO MINIMIZE ITS DAMAGE

Abstract

Inundation process of both the ground surface and the underground space in urban area due to a heavy rainfall was studied numerically. In the present study, the plan which minimizes the damage which is expected to arise in the underground space is the object of research. Basic idea is that the inflowing water from the ground surface to the B1 level (that is, the commercial space) is to be led to the B2 level (the parking space) as soon as possible. In order to accomplish this, the arrangement and the width of stairs between B1 and B2 level are found to be important. Several effective plans other than this were also proposed here.