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Environmental Sciences Europe

Table 1 Site characteristics of the three focus areas based on the digital orthophoto (DOP) of 2019 [54] and the DEM1 of 2018/19 [53]

From: Evaluation of the high-energy flood of mid-July 2021 as a morphologic driver in the anthropogenically developed Ahr Valley, Germany, in interaction with infrastructures

Focus area

Mean hillslope in 2021 flooded area [°]

2019 River section length [km]

2019 River section area [m2]

2019 Riverbed gradient [‰]

River width by valley width [m/m]

1

5.7

0.727

7717

4.57

0.05–0.11

2

9.8

5.094

72,318

3.34

0.05–0.38

3

2.8

2.692

31,853

3.21

 ≤ 0.015

  1. The mean daily discharge when the DOP 2019 was taken (cf. Table 2) corresponds to an average low discharge [55, 56]
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