APPLICATION OF COMPUTER MODELING METHODS OF FLOOD ZONES AT MAXIMUM DESIGN WATER LEVELS FOR SOLVING PROJECT TASKS IN THE DISTURBED LANDS RECULTIVATION AND DESIGN OF BUILDINGS AND FACILITIES NEAR WATER BODIES

Abstract

The relevance of modeling zones of maximum flooding of rivers (flood zones) during engineering surveys for design and construction of economic activity objects, development of projects for the disturbed lands recultivation in the zones of direct impact of water bodies is related to the fact that under current conditions, with ever-increasing requirements for security and business continuity of the projected facilities, the existing methods for assessing the risk of flooding do not always give a satisfactory result in order to fully assess whether there is a risk for the projected facility or not. The main aim of the research is to analyze domestic and foreign experience in modeling flood zones at maximum river water levels for practical solution of problems of engineering design, to assess advantages and disadvantages of the main approaches in the practice of surveys, to demonstrate the possibilities of modeling method for solving a particular engineering problem. Methods. The method of spatial data analysis for creating a digital terrain model via geoinformation systems was used for preparing initial data; the method of numerical simulation of the Inya river flood zone and the abandoned quarry excavation located on the left bank as part of the works on preparation of the project for the disturbed lands recultivation was used to calculate the maximum flood zone. Numerical modeling was carried out using HEC-RAS simulation system, ver. 5.0.5. Results. The author has carried out the review of the existing worldwide and domestic practice of numerical modeling of flood zones for rivers when solving the problems in the field of engineering design. The paper introduces the author's own model of the calculated flood zone on the example of the recultivation site «Mokhovskoye pole». The example of assessment of the impact on the recultivated object when implementing the most negative scenario (probable flooding of the pit in the period of the maximum water flow of 1 % occurrence) was shown, the advantages and disadvantages of applying different approaches in practice were described.

Keywords

• geoinformation systems
• numerical modeling of the flood zones of rivers
• 2d modeling
• digital elevation model
• remote sensing data
• modeling systems
• hec-ras