Citation: | BAI Xiaoxia, FAN Yongyong, WANG Houjie. Erosion and deposition evolution of the abandoned Diaokou course of the Yellow River and influential factors[J]. Marine Geology Frontiers, 2023, 39(10): 34-42. doi: 10.16028/j.1009-2722.2022.121 |
From 1964 to 1976, the Yellow River flowed through the Diaokou course into the Bohai Sea. In 1976, the Diaokou course was abandoned and replaced by an artificial diversion to the Qingshuigou course. Based on the measured elevation data of the abandoned Diaokou course in years of 1976, 2000, and 2016, we calculated the volume of erosion and deposition along the Diaokou course at different stages, described the spatial distribution of erosion and deposition of the Diaokou course, and discussed the potential impact factors on the Diaokou course evolution over the last 40 years after its abandonment. The results indicate that during 1976-2000, the Diaokou course experienced erosion at rate of ~1.92×106 t/a, and during 2000-2016, the Diaokou course was silted at deposition rate of ~7.99×106 t/a. The erosion and deposition along the Diaokou course present significant spatial difference during 2000-2016. Taking section D20 as the boundary, the seaward river section was in scouring state, and the storage capacity of river channel increased; while the landward section was in siltation state, and the storage capacity of the river channel decrease. The evolution of erosion and sedimentation in the Diaokou course was not only affected by the ecological water diversion and marine dynamic erosion, but also by the development of nearby oil fields, farming, and forestation. Therefore, to maintain the water flow capacity of the Diaokou course, cleaning up the Diaokou course is urgent to ensure good condition of the Diaokou course as a backup waterway of the Yellow River seaward empting.
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Migrations of the lower Yellow River courses since 1855
Landsat8 OLI image of the Yellow River Delta (2021) and the study area (framed)
Landsat4 MSS image of Diaokou course of the Yellow River in 1976
Landsat11 OLI image of Diaokou course of the Yellow River in 2016
Comparison in thalweg depth and river width at each cross-sections in 1976 and 2000
Distribution in storage capacity of the Diaokou course in 1976 and 2000
Profiles of the Diaokou course in 2000 and 2016 across D7, D14 and D22 transections
Comparison in thalweg depth and river width at Diaokou course between 2000 and 2016
Comparison in tank storage capacity of the Diaokou course in 2000 and 2016 at transections D1-D12, D12-D20, and D20-D25
Erosion and deposition rates of the Diaokou course in different periods