The unique geographical environments and climate conditions have caused severe flood disasters constantly in Gaoyao area. Thus, an "isomorphism relationship" has been established between the historical geographical environments (such as topography, landform, historical flood areas and historical embankment scope) and the settlement distribution of "Bagua (the Eight Diagrams)" pattern in the areas. Through graphic analysis and logical inference, we explain the inherent cause of the "isomorphic relation": "the Eight Diagrams" form is the optimal form for flood control. Due to the incomplete regional flood-control facilities in Gaoyao area before the Republic of China, a large number of settlements located at the south bank of Xijiang River within the flood area lacked levee protection and had to adopt the passive flood-control way with the form of "the Eight Diagrams".
The existence of the "isomorphism relationship" shows that it is complementary and interconnected dialectical between the regional flood control strategy and settlement self-flood control strategy. In the era that the regional flood control strategy had not been perfected, the settlement self-flood control strategy, as an important supplement to the flood control strategy, resulted in a special settlement flood control pattern. However, the present regional flood control strategy is basically perfect and the settlement is effectively protected from flood disaster. The existing significance of the settlement self-flood control strategy is greatly reduced, and settlements' "Eight Diagrams" form gradually disorganized and changed. And this is an important cause of the evolution of settlement form. After the problem of regional flood control was settled, a large number of settlements continuously extended to low-lying areas, which has already contradicted the former passive flood control plan resulting in irrational and unordered expansion. The present mentality in contempt of precautions against natural calamities has caused hidden danger of flood disasters.
ZHOU Yixin, LV Tangjun
. Research on relationship between the evolution of settlement form and the change of flood control function：A case study from Gaoyao area, Guangdong province[J]. GEOGRAPHICAL RESEARCH, 2014
, 33(3)
: 439
-450
.
DOI: 10.11821/dlyj201403004
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