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The Upper Stör catchment is located in the middle of Schleswig-Holstein, Northern Germany, with a river length of 25 km and a drainage area of 468 km2 (Figure 1(a)). As part of the Northern Germany lowland area, the altitude of this area falls from 90 and 60 m in the western and eastern parts, respectively, to 2 m a.s.l. at the outlet. In most of the catchment the gradients are smaller than 1 °, except the south western part, which has gradients of more than 3 ° (LAV S-H 1995). Due to the high latitude and low lying terrain, shallow groundwater tables and older glacial and glaciofluvial sediments cover the basin, and there are criss-cross ditches, drainage pipes and canalization. In addition, this area is controlled by a temperate maritime climate, with an annual precipitation of 831 mm/year and a mean annual temperature of 8.3 °C (Müller-Wohlfeil et al. 2000; Schmalz et al. 2008; Schmalz & Fohrer 2009). The combination of terrain and climate has promoted agricultural activity, and has resulted in a land use pattern dominated by arable land (48.1%), pasture (29.5%) and forest (9.1%). Ten river sections were selected according to the following criteria: a smooth and regular inner river wall; no flood regulation; no turbulence caused by large obstacles, dams or waterfalls. The attributes of the ten river sections are shown in Table 1.
Table 1

The hydraulic information of the 10 selected river reaches (January 2012)

Site no.River nameCatchment size (km2)Gradient (%)a
Widthb
Depthb
Velocityb
Dischargeb
MH(m)CV(m)CV(m/s)CV(m3/s)CV
S02 Schwale 70.09 0.21 0.15 7.29 0.85 0.88 0.41 0.44 0.24 2.85 0.53 
S03 Dosenbek 30.98 0.20 0.28 4.84 0.79 0.51 0.53 0.43 0.19 1.05 0.49 
S07 Stör-Luxemburg 33.29 0.09 0.06 7.27 0.46 0.53 0.34 0.33 0.15 1.23 0.38 
S09 Stör-Padenstedt 196.05 0.43 0.59 9.14 0.44 1.12 0.42 0.79 0.26 7.90 0.29 
S10 Aalbek 32.34 0.10 0.11 5.42 0.78 0.70 0.63 0.58 0.22 2.13 0.47 
S12 Mitbek 60.63 0.25 0.32 5.49 0.92 0.81 0.51 0.47 0.28 2.03 0.51 
S16 Fuhlenau 32.33 0.09 0.09 13.21 0.50 0.87 0.42 0.32 0.15 3.45 0.41 
S17 Buckener Au 56.92 0.05 0.02 5.46 0.68 0.89 0.55 0.39 0.19 1.86 0.44 
S20 Bücener 203.02 0.19 0.21 12.14 0.52 1.63 0.43 0.62 0.15 12.33 0.32 
S21 Stör-Willenscharen 461.74 0.10 0.15 15.96 0.37 1.85 0.24 0.59 0.13 17.46 0.30 
Site no.River nameCatchment size (km2)Gradient (%)a
Widthb
Depthb
Velocityb
Dischargeb
MH(m)CV(m)CV(m/s)CV(m3/s)CV
S02 Schwale 70.09 0.21 0.15 7.29 0.85 0.88 0.41 0.44 0.24 2.85 0.53 
S03 Dosenbek 30.98 0.20 0.28 4.84 0.79 0.51 0.53 0.43 0.19 1.05 0.49 
S07 Stör-Luxemburg 33.29 0.09 0.06 7.27 0.46 0.53 0.34 0.33 0.15 1.23 0.38 
S09 Stör-Padenstedt 196.05 0.43 0.59 9.14 0.44 1.12 0.42 0.79 0.26 7.90 0.29 
S10 Aalbek 32.34 0.10 0.11 5.42 0.78 0.70 0.63 0.58 0.22 2.13 0.47 
S12 Mitbek 60.63 0.25 0.32 5.49 0.92 0.81 0.51 0.47 0.28 2.03 0.51 
S16 Fuhlenau 32.33 0.09 0.09 13.21 0.50 0.87 0.42 0.32 0.15 3.45 0.41 
S17 Buckener Au 56.92 0.05 0.02 5.46 0.68 0.89 0.55 0.39 0.19 1.86 0.44 
S20 Bücener 203.02 0.19 0.21 12.14 0.52 1.63 0.43 0.62 0.15 12.33 0.32 
S21 Stör-Willenscharen 461.74 0.10 0.15 15.96 0.37 1.85 0.24 0.59 0.13 17.46 0.30 

aThe M column is the real measured river gradients, and the H column is the HEC-RAS calibrated gradients.

bThe first column under width, depth, velocity and discharge were averaged values of seven cross sections surveyed in the field from the flood season. The second column is the CV of all the cross sections sampled from the same river in the flood season and moderate water level season.

Figure 1

Locations of the upper Stör catchment in Northern Germany (a), measurement of cross sections along the river section (b), measurement point distribution throughout the cross-sectional area (c), and (d) measurement of the river bed elevation.

Figure 1

Locations of the upper Stör catchment in Northern Germany (a), measurement of cross sections along the river section (b), measurement point distribution throughout the cross-sectional area (c), and (d) measurement of the river bed elevation.

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