The Spatio-temporal Changes and the Human Land Relationship Pattern of the Flooded Areas of the Lower Yellow River Region in the Ming and Qing Dynasties
The environmental impact and surface shaping by the overflown water and sediment of the lower reaches of the Yellow River during the Ming and Qing Dynasties on the plain areas along the Ying River were relatively light.There was no obvious crevasse fan landform formed on both sides of the Ying River,and the yellow floodwater and sand generally did not overflow southwest across the Ying River.The main stream of the Ying River had long been a good receptor for yellow floodwater and sand and also a boundary line for its southwest expansion.The areas along the Wo River were affected by the dual effects of the southward flooding of water and sand from the breach of the Yellow River's main channel during the Ming and Qing Dynasties,as well as the flooding of water and sand caused by the Wo River itself while its bed was occupied by the Yellow River floods.The edge zone of the core breach fan on the south bank of the Yellow River's main channel intersected with the secondary breach fan along the Wo River,forming a superimposed breach fan landform along the Wo River area.The main stream of the Wo River had long served as the boundary between the severely affected areas and the lightly affected areas of the Yellow River flood.The water accumulation surface of large lakes and depressions usually moved back and forth with the front edge of the Yellow River floodplain fan.The soil distribution and crop structure characteristics of Yutai County provided good evidence that the Nansihu Lake depression had long served as the boundary of the Yellow River flood breach fan.Nansihu Lake was an important flood storage and adjustment area for the northward spread and expansion of Yellow River overflown water and sediment during the Ming and Qing Dynasties.
flooded areas of the Lower Yellow River Region during Ming and Qing Dynastiesexplicit boundarycrevasse fan landformsoilflood memories
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