Chaohu Lake Basin Of Ming Dynasty Spatial And Temporal Distribution Of Floods And Droughts

The research of the historical geography of the area and historical valley have gained significant achievements. Chaohu Lake Basin’s unique natural geographical environment and peculiar local culture and systematic politics, so that it is a typicality and valuable study area. This paper tries to do some preliminary research to find out the temporal and spatial distribution features of the flood and drought disasters in Chaohu Lake Basin of Ming Dynasty, include flood and drought’s time distribution, season distribution and geographic spatial distribution. Frequency variation and intensity change of flood and drought were also this paper’s important research contents. Frequent floods and droughts have exerted profound influence on Chaohu Lake Basin’ agriculture and social life and natural environment. Based on this situation, the author tryies to use the theories and methods of history, historical geography, statistics and other disciplines to take advantage of complicated, numerous historical-materials about disasters of Chaohu Lake Basin. All that were in order to compare flood and drought’s time distribution difference and spatial distribution difference and reveal the inherent law of the disaster.Specific arrangements are as follows:Part one serves as the introduction of the whole research, Firstly, introduce this topic’s academic value and practical significance. Then, define the period of time and the area of this topic’s research scope. Last, review the academic achievements of natural disasters and evaluate the research status of Chaohu Lake Basin’s floods and droughts.Part two analyzes the disaster grade of the flood and drought disasters in Chaohu Lake Basin of Ming Dynasty, Firsty, define the concept of flood and drought. Then, introduce the way to classify the disaster grade in meteorology and analysis the time, area coverage, consequence etc influence factors of classify the disaster in science of disaster, on this basis, summarize a new floods and droughts hierarchy method. Last, sort out the chronological chart of floods and droughts of Chaohu Lake Basin in Ming Dynasty.Part three is the temporal and spatial distribution features of the flood and drought disasters in Chaohu Lake Basin of Ming Dynasty, According to analysis time and space characteristics of floods and droughts, some basic conclusions about disaster regular have been achieved. Pay attention to variation tendency of disasters’frequency and shrength. Last, compare the flood and drought.Part four explains the natural causes and influence of the flood and drought disasters in Chaohu Lake Basin of Ming Dynasty. Natural factors were the main cause of the flood and drought. Frequent floods and droughts have exerted profound influence on Chaohu Lake Basin’ agriculture and social life and natural environment which arouse another floods and droughts in turn.