Rainfall Regime In Shaanxi Province In The Qing Dynasty And Related Studies

This research based on the Qing Dynasty, Republic of China’s many kinds of historical document (local chronicle, reports file, diary and so on) the material, in the use scientific method judgment precipitation phenomenon foundation, includes the Qing Dynasty Shaanxi rainfall situation the related record, and withdraws the rainfall situation to have the time ("date" precision), the place ("county" precision), the historical data original record and so on, tool establishes the Qing Dynasty Shaanxi rainfall situation timeline finally by Microsoft the Excel, for details see appendix2, appendices3. According to the rainfall situation record characteristic, the union modern rainstorm concept limits, the formulation suits this research the rainstorm determination standard, withdraws information and so on rainstorm occurrence and duration, place, disaster situation degree from the including rainfall situation material. Under the Database technical support, establishes under the multiple source historical data the Qing Dynasty Shaanxi rainstorm timeline databases, at present this database also in establishment.In addition, this article involves with the precipitation rainfall situation related question research mainly has:①Qing Dynasty in Shaanxi local history information to collect, collate precipitation records of the Weihe River downstream area hazard analysis of the spatial and temporal characteristics of the floods precipitation, results showed that:The time pattern for the flood occurred in the clear before the mid-hours, and more for the summer and autumn; space law for the flood occurred in the eastern county. Preliminary judgment is mainly due to prolonged rainfall caused floods and heavy rainfall, floods caused by heavy rains;②The flood season up water retained in the Qing Dynasty Memorial on size records, since the modern hydrological stations of the middle reaches of the Yellow River water level information on measured data, based on the1766-1911Markham Beach, the middle reaches of the Yellow River (located today in Sanmenxia City, Henan Province) water level Chi pile rising water contained in time,"Hou" scale, Sanmenxia section of the flood season in the study period start time. The results showed that:1766to1911, the middle reaches of the flood season began in the1840s at an average level; the flood season of1840and the1860s to establish a later time;1860to the1890s again began to advance. Average in early July in the middle reaches of the Yellow River flood season began in the study period, with the rainy season of the middle and lower reaches of the Yangtze River end time good correspondence between the inter-annual differences in summer wind and rain with the passage of time become the middle reaches of the flood season start time fluctuates the main driving factors;③the middle reaches of the Yellow River1843,1844flood events, the results show:1843Yellow River flood affected counties of39, mainly located in northern Anhui, eastern Henan. The flood caused Zhongmu July18to23bursts, Sanmenxia section9August the highest peak in the past500years, the spate of breaches at the risk of further floods, erosion, resulting in the Yellow River in Zhongmou2shares of the main bifurcated flow wins the Ying River The Wohe etc. Huaibei of inflow of the Huaihe River. The main reason for the1843Yellow River flood year Jinnan-frequent rain bands off in the upper reaches of the Central, Fenhe-and Beiluo, this phenomenon may be stronger this year, the subtropical high, the continuous northward JAC the rain bands north into the Yellow River Basin, rain bands caused in the Huaihe River continued stable.