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- Title
山东沂河中游段古河道形态特征与古流量.
- Authors
曹光杰; 于 磊; 张学勤
- Abstract
With the middle reaches of the Yihe River as the study area, the authors drew stratigraphical cross sections of paleochannels based on the drilling data in five places which included the Bashan rubber dam, the Beishe rubber dam, the Nanwangzhuang Yihe Bridge, the S336 Yihe Bridge, and the Aucma Yihe Bridge. The authors applied electrical sounding method to the cross section of Yihe River near Zhuyang Village, and derived the depth of sediments which was further calibrated by the drilling records. Based on the corrected results of sediment depth, the authors drew the stratigraphical cross section of the ancient river channel at this place. Also, the authors dated 15 samples collected at the Yihe River banks near Zhuyang Village and the Acuma Bridge at the OSL laboratories in the Qinghai Institute of Salt Lakes of Chinese Academy of Sciences and Nanjing Normal University. Finally, the authors analyzed the configuration of the cross section at the Aucma Yihe River Bridge, and calculated river discharge at the Last Glacial Maximum (LGM), the Late Glacial Epoch (12 000 aB.P.), and the Mid-Holocene (7 000 aB.P.) using the discharge-sediment relation. It is concluded that the bedrock below the current river bed was the paleo-channel at the LGM whose stream gradient was higher. The ancient river took a braided form, which was characterized by a larger breadth-depth ratio, and wide and shallow river channels. At the cross section near the Aucma Yihe Bridge, the discharge at the LGM, the Late Glacial Epoch, and the Mid-Holocene were approximately 17 m3/s, 20 m3/s, and 30 m3/s, respectively.
- Publication
Acta Geoscientica Sinica, 2019, Vol 40, Issue 3, p417
- ISSN
1006-3021
- Publication type
Article
- DOI
10.3975/cagsb.2018.080802