Hidrológiai Közlöny, 2017 (97. évfolyam)
2017 / 3. szám - MANAGING ENVIRONMENTAL RISKS - FLOOD PROTECTION EXPERIENCES AND COOPERATION IN THE DANUBE RIVER BASIN - Engi Zsuzsanna: Flood hazard modelling of the River Mura based on the silting up processes of the inundation area
Zsuzsanna Engi: Flood hazard modelling of the River Mura based on the silting up processes of the inundation area 93 Table 3. Changing of significant morphometric parameters of the river at different times Significant morphometric parameters 1785 1860 1880 1920 1976 2002 2014 Total length of the central line (m) 53856 37586 37598 43141 49241 50306 49552 Width of the river (m) 185 154 14094 74 80 Number of meanders 71 52 52 62 100 101 97 Length of the bend (m) 759 723 723 696 492 498 512 Amplitude of meanders (m) 126 no 88 122 73 75 81 Figure 16. Development of meanders in experimental area 1 (near Muraszemenye) and the development phases of the omega-meander in experimental area 2 (adaptedfrom: Hungarian Archive - Arcanum; Engi et al. 2016a) Figure 17. Lateral movement of the meander near the village Muraszemenye: after one flood event A) — B), in the period of 1998-2011 C) and between 1920-2014 D) (Engi 2016) The meander belt The meander belt (Leopold and Wolman 1960, Gurnell 1995) was delineated for the mentioned time periods {Figure 18) and the areas were calculated. The details of the belt area movement were shown and it was suggested that more room was needed for meander movement. Currently, the flood hazard maps are produced on the basis of the static path of the river, not taking into account the possible meander movements that might cause an increase in the flooded area. The path of the river during the First Military Survey, which crosses the flood protection dykes in some locations, was shown (Engi, 2016) (Figure 19).
