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In the study area, the left bank along the flow direction is an erosional bank while the right bank is a depositional bank (Figure 2(a)). During the campaign in January 2015, a total of 18 tests were conducted along the meandering right bank with a length of 180 m, which could be divided into three sections including two convex banks (CB1 and CB2) as well as one depositional area (DA) (Figure 3(a) and Table 1). The mean value of water depth from test points was approximately 0.15 m, and the river width ranged from 136 to 160 m. The longitudinal slope was 0.167‰ and the direction of water flow was east-north east (ENE). The meandering bank induced sediment erosion and deposition from flood. The materials in the streambed sediment along CB1 and CB2 contained mostly fine sand. The sediment materials along the DA consisted of silt deposition in the upper layer and fine sand and gravel in the lower layer of vertical layers 0.80 m depth.
Table 1

Evaluations of different sections along the bank in the Weihe River in January and July 2015

SectionsTest pointsRanges of flux (mm d−1)Mean flux (mm d−1)Standard deviation of fluxLargest curvature (m−1)Mean velocity (m/s)
CB1 1–9 19.59–78.81 49.15 22.43 0.18 0.54 
DA 10–12 58.83–81.12 67.81 11.76 –* 0.34 
CB2 13–18 32.91–72.52 52.74 13.27 0.05 0.40 
SB1 1–5 24.57–27.21 25.89 1.02 0.31 
SB2 6–9 31.85–34.44 32.40 1.22 0.30 
CB3 10–17 18.03–27.63 23.30 4.28 0.08 0.25 
SectionsTest pointsRanges of flux (mm d−1)Mean flux (mm d−1)Standard deviation of fluxLargest curvature (m−1)Mean velocity (m/s)
CB1 1–9 19.59–78.81 49.15 22.43 0.18 0.54 
DA 10–12 58.83–81.12 67.81 11.76 –* 0.34 
CB2 13–18 32.91–72.52 52.74 13.27 0.05 0.40 
SB1 1–5 24.57–27.21 25.89 1.02 0.31 
SB2 6–9 31.85–34.44 32.40 1.22 0.30 
CB3 10–17 18.03–27.63 23.30 4.28 0.08 0.25 

*Indicating no data obtained due to uncertainty of changeable bending induced by the depositional processes.

Figure 2

Schematic diagrams of the locations of test points close to the right bank in the Weihe River, indicating the sediment erosion and deposition along the bank (a), and measurement setup of temperature distributions in streambed sediment with the temperature pipe (b).

Figure 2

Schematic diagrams of the locations of test points close to the right bank in the Weihe River, indicating the sediment erosion and deposition along the bank (a), and measurement setup of temperature distributions in streambed sediment with the temperature pipe (b).

Figure 3

Test sites showing the three divided sections along the bank in January 2015 (a) CB1, AD, CB2 and three other divided sections along the bank in July 2015 (b) SB1, SB2, CB3. (The x-axis is the distance from the first test point on the bank along the flow direction; the y-axis is the perpendicular distance from the test site point to the x-axis.)

Figure 3

Test sites showing the three divided sections along the bank in January 2015 (a) CB1, AD, CB2 and three other divided sections along the bank in July 2015 (b) SB1, SB2, CB3. (The x-axis is the distance from the first test point on the bank along the flow direction; the y-axis is the perpendicular distance from the test site point to the x-axis.)

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