Table 3 Overview of object digitalization of the map data basis
Analysis | Object | Criterion | Applied to…(cf. Table 2) |
|---|---|---|---|
Lateral Mobility Index (LMI) (cf. Fig. 4) | Riverbanks/ surface area of river section as polygons | Visible embankment, vegetated and dry, or confining rock or artificial structure. If embankment is not visible due to tree canopies, the riverbank position was estimated | Historic hand-sketched maps and all DOP |
Impacts | |||
| Bridges and bridge piers | Outlines of bridges crossing the river or outlines of piers at the location of former bridges within the riverbed or on the embankment | DOPs 2019, Jul 2021, Sept 2021, and Jun 2022 |
| Other man-made structures | Outlines of buildings, streets, concrete structures, walls, paved areas within flooded area of July 2021 | DOPs 2019, Jul 2021, Sept 2021, and Jun 2022 |
| Trees | Outlines of uprooted roots and branches. Overlapping trees are digitalized as cluster | DOPs 2019, Jul 2021, Sept 2021, and Jun 2022 |
Structures | |||
| Mud deposits | Discoloration in the riverbed showing mud accumulation. Distinguished from shoals by their color | DOPs 2019, Jul 2021, Sept 2021 and Jun 2022 |
| Stagnant water pools | Water-filled pits with a clear separation from the main channel by a small stripe of land or debris accumulation. Water-filled pits on the floodplain within the flooded area of July 2021 | DOPs 2019, Jul 2021, Sept 2021, and Jun 2022 |
| Shoals | Accumulations of sand and gravel. Areas are distinguished from islands and riverbanks by the lack of vegetation | DOPs 2019, Jul 2021, Sept 2021, and Jun 2022 |
| Artificial deposits and rip-rap | Rock deposits for riverbank stabilization, or floodplain extension by deposits in the riverbed | DOPs 2019, Jul 2021, Sept 2021, and Jun 2022 |
