Study On Mountain Flood Geological Disaster Risk Of Typical Region In WenZhou City Based On ArcGIS

Mountain flood geological disaster more serious geological disasters in China's natural disasters, in a variety of natural disasters, geological disasters caused by flash floods damage and casualties very seriously, so to prevent flash floods in China's situation is quite serious geological disasters. Research shows that many geological disasters such as landslides, avalanches, landslides, subsidence, etc., are secondary disasters caused by floods, so the flood studies for more and more levels of government and professional and technical staff are highly valued.The fact that a large number of studies show that the uncertainty of the flood disaster is nature of flood disasters, flood risk analysis become a research hotspot, which is flood uncertainty as an objective description of the line. This study is based on ArcGIS technology, through the collection of Wenzhou typical risk analysis of flood related information, and the establishment of flood-related disaster risk assessment model based on AHP and ArcGIS with spatial analysis methods. The three aspects of flood risk analysis from Wenzhou City, flooding risk analysis, vulnerability analysis, and flood risk zonation of Wenzhou City,. on the basis of the comprehensive analysis of typical flood hazard areas, vulnerability and flood risk division in WenZhou city, and ultimately the formation of typhoons and storms damage assessment Wenzhou visualization software has been finished,which was for the government's flood control decisions. Understanding and conclusions of the main six areas, including the following.(1) Based on the natural and geographical overview of Wenzhou, Wenzhou City, which was with distribution of administrative divisions and dams, the study area was divided into the typical flood of Wenzhou Aojiang River, Feiyun River basin, watershed and Liu Leping Nanxi original, Wen Ruiping original, Rui Pingping the original, such as the South Plains of 7 typical area inundated disaster as the basic unit of the township.(2) Wenzhou typical regional flood disaster risk theory is that is typical of regional flood disaster in Wenzhou from Wenzhou, a typical risk analysis of flood hazard areas, vulnerability, flood hazard zonation composition,which was combined with characteristics of Wenzhou City, thus the rask analysis of typical region in WenZhou city included Wenzhou 7 a typical study area of flood risk zonation.(3) Which was the establishment of the risk assessment model based on ArcGIS about typical of the study area,which was Wenzhou 7 different level of the submerged area, which was included depth analysis of distribution and variation analysis, and the corresponding land like housing, such as population or residents points and flooded roads.Which was the the above comprehensive analysis for the evaluation of the township units, the Wenzhou seven typical study area was divided into three levels, high riskⅢ, the riskⅡ, low risk ofⅠ.(4) Which was Wenzhou typical regional vulnerability analysis. Including the cultivated land, housing, population, settlements and roads,there are five typical indicators as vulnerability factors.In the study area, and its vulnerability determined the impact of grading and factor weights, and then came to the study area, Which was done Wenzhou typical factors affecting the degree of comprehensive vulnerability and integrated distribution of the degree of vulnerability factors. Based on the above analysis, in evaluation of the township units the Wenzhou seven typical level of vulnerability of the study area is divided into three levels, which was named high vulnerabilityⅢ, the vulnerabilityⅡ, low vulnerabilityⅠ(5) Wenzhou typical flood risk zonation of the study area is based on typical of the study area in Wenzhou and Wenzhou typical risk analysis in the study area. The vulnerability analysis carried out both by risk and vulnerability of different levels of the assignment,which was the use of risk level (R)=risk (H)×vulnerability (v) the formula for the evaluation of the township units about the study area. Wenzhou typical risk is divided into three levels, namely high-risk sexualⅢ, the riskⅡ, low risk ofⅠ, and the use of ArcGIS technology Wenzhou typical synthesis of the study area superimposed Risk Maps.(6) Which was Wenzhou typhoon storm damage assessment software design and development. To make use of ArcGIS platform for technology, Wenzhou City rainstorm disaster evaluation system was designed and developed, and data Wenzhou typhoons, floods and tidal flood disaster area quickly query, update and display.