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根据2100余个钻孔资料,并结合大比例尺地形图、航片、卫片判读分析,以及野外实地考察和沉积物样品的粒度分析、岩相分析、14C测年,研究了莱州湾南岸平原浅埋古河道带的分布规律、埋藏和沉积特征、古河道的分期断代以及与海(咸)水入侵关系.该区在埋深60m内的浅埋古河道带,可分成弥河、潍河和白浪河3个系统,它们大都呈掌状、放射状分布,并与其所属河流的冲洪积扇范围相吻合.该区古河道的形成和发育与古气候和海平面变化密切相关.自晚更新世晚期以来,该区有4期古河道发育,其中玉木旱冰期古河道和玉术主冰期古河道的砂层沉积粒度粗、连通性好、分布广,既是富水性强、水质好的淡水含水层,又是该区海(咸)水入侵的主要通道.控制在浅埋古河道带超采地下淡水,并在丰水季节利用其进行地下水回灌,是治理该区海(咸)水入侵灾害的重要措施之一.
Based on more than 2,100 borehole data and combined with large-scale topographic maps, aerial photos, satellite interpretation analysis, field investigation and grain size analysis of sediment samples, lithofacies analysis and 14C dating, the shallow of the southern coast of Laizhou Bay was studied. The distribution of buried ancient river courses, burial and sedimentary characteristics, the ancient river faulting and the relationship with sea (salty) water intrusion. The shallow buried ancient river courses in the depth of 60m can be divided into three systems: Mihe River, Weihe River and Bailu River. Most of them are palm-shaped and radially distributed, which coincide with the alluvial-accumulating fan of the river to which they belong. The formation and development of ancient river courses in this area are closely related to paleoclimate and sea level changes. Since the late Pleistocene, there have been 4 ancient river courses developed in this area. Among them, the ancient river courses during the Yushu roller glacier period and the ancient river courses during the Yushu glacier period have coarse sediment grain size, good connectivity and wide distribution. They are both rich in water and good in water quality Of freshwater aquifers, but also the sea (salty) water invasion of the main channel. It is one of the important measures to control the sea and salt water intrusion in the shallow ancient river channel by controlling overground mining of fresh water and using it for recharge during the wet season.