Assessment of the effect of vegetation on the transition of the flood wave using hydraulic 2D models

Krzysztof Wolski,Tomasz Tyminski,Pawel B Dabek,B Kaźmierczak,K Piekarska,P Jadwiszczak,M Kutyłowska

doi:10.1051/e3sconf/20184400195

Abstract

In the paper an impact of vegetation accumulation on flood wave transition is presented. The research was conducted with use of the MIKE FLOOD model which combines elements of 1D and 2D numerical models. The study area included a 5.5 km long section of the Bystrzyca River near Wroclaw, Poland. A hydraulic model was constructed, on which the simulation of water transition with the probability of occurrence p = 1% and p = 0.2% was conducted. The simulation was carried out for current bank vegetation conditions determined on the basis of precise LIDAR data and for conditions with no vegetation. In this way, the direct impact of vegetation on flood wave transition was obtained. Acquired results, a decrease in maximum water levels and a reduction of flooded area, show that the hydraulic influence of vegetation on high water bed should not be underestimated.

Highlights

The outbreak of water from river bed is a natural process which accompanied humanity for ages
It is well known that in recent years the number of floods and loss associated with them is growing [1, 2], which is caused by changes in land use patterns, climate, and changes in land management in river valleys [3, 4]
On the previously defined model the simulation was performed for water with the probability of occurrence p = 1% (100-year water) and for water with the probability of occurrence p = 0.2% (500-year water)

Summary

Introduction

The outbreak of water from river bed is a natural process which accompanied humanity for ages. It were the river valleys where first human settlements arose which could develop agriculture thanks to the river flooding providing fertile sediments. It is well known that in recent years the number of floods and loss associated with them is growing [1, 2], which is caused by changes in land use patterns, climate, and changes in land management in river valleys [3, 4]. Among important issues connected with river management, the understanding of flood events and predicting flood-prone areas and potential damage have become especially compelling [2]

Methods

Results

Conclusion