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古河道是古时水系变迁遗留下来的旧河道,在山区、平原和海底均有分布。黄淮海平原进入全新世以来,主要由黄河、淮河、海河和滦河等河流不断决口改道,反复泛滥冲淤形成,因此,古河道比比皆是。以海河平原的黑龙港地区为例,现已查明的古河道有300多条、段,面积约15000平方公里,占该地区总面积的1/3以上,它不但控制着地貌、土壤类型、地下水,震害与旱涝碱薄灾害的分布,从而为
Ancient river is ancient river system left over from the old river, in the mountains, plains and the sea floor are distributed. Since the Huang-Huai-Hai Plain entered the Holocene, the Yellow River, the Huaihe River, the Haihe River and the Luanhe River continued to breach the diversion route and repeatedly formed scouring and silting. Therefore, the ancient river courses abound. Taking the Heilonggang area of Haihe River Plain as an example, there are over 300 ancient river courses identified, covering an area of about 15,000 square kilometers, accounting for more than one third of the total area of the area. It not only controls landforms, soil types, Groundwater, earthquake damage and the distribution of droughts and alkali thin disasters, thus