山东沂河中游段古河道形态特征与古流量
投稿时间:2018-06-06  修订日期:2018-07-20  点此下载全文
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曹光杰 临沂大学 资源环境学院 guangjiecao@163.com 
于 磊 临沂大学 资源环境学院  
张学勤 临沂大学 资源环境学院  
基金项目:“末次盛冰期以来沂河古河道与古流量研究”(41372182)[Foundation: National Natural Science Foundation of China “Research on paleochannel and paleocurrents of the Yihe River since the LGM”(41372182)]
中文摘要:选择沂河中游段作为研究河段。根据芭山橡胶坝、北社橡胶坝、沂水县南王庄沂河大桥、336省道(S336)沂河大桥、沂南县澳柯玛沂河大桥的钻孔资料,绘制了5个断面沂河古河槽地质剖面图。在洙阳村附近沂河断面进行了电测法物探,根据钻探验证结果对物探测量的沉积层厚度进行了校正,绘制了洙阳村附近沂河断面古河槽地质剖面图。在洙阳村附近沂河两岸,澳柯玛沂河大桥附近沂河西岸,挖掘剖面采集了光释光(OSL)年代样品,在中国科学院青海盐湖所、南京师范大学光释光实验室进行了测试,获得了15个年代结果。选择澳柯玛沂河大桥附近剖面,用河相关系法计算了末次盛冰期(LGM)、晚冰期(约12 000aB.P)和全新世中期(约7 000aB.P)的古流量。结论认为,沂河现在河床下方的基岩河槽为末次盛冰期的古河槽,古河道纵比降较大;古河槽宽深比大,河槽宽浅,属于砾石河床分汊型;澳柯玛沂河大桥断面,末次盛冰期、晚冰期、全新世中期古流量分别约为17m3/s、20m3/s、30m3/s。
中文关键词:沂河  古河道  古流量  末次冰期最盛期  晚冰期  全新世
 
Morphological characteristics of the paleo-channel and paleo-discharge in the middle reache of the Yihe River in Shandong Province, China
Abstract:Taken the middle reach of the Yihe River as the study area, we made stratigraphical cross sections of paleochannels based on the drilling data for five places which included the Bashan rubber dam, and the Beishe rubber dam, the Nanwangzhuang Yihe Bridge, the S336 Yihe Bridge, and the Aucma Yihe Bridge. We 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, we made the stratigraphical cross section of the ancient river channel at this place. Also, we dated 15 samples in the OSL laboratories at the Qinghai Institute of Salt Lakes, CAS and Nanjing Normal University, which were collected at the Yihe River banks near Zhuyang Village and the Acuma Bridge. Finally, we 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 (12000aB.P), and the mid-Holocene (7000aB.P) using the discharge-sediment relation. We 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 m<sub>3</sub>/s, 20 m<sub>3</sub>/s, and 30 m<sub>3</sub>/s, respectively.
keywords:Yihe River  Paleo-channel  Paleo-discharge  The last Glacial Maximum  The late Glacial Epoch  The mid-Holocene
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