| Town in Wenchuan County in Sichuan 8.0 earthquake occurred, earthquake caused serious damage to the province's 12 counties,(beichuan Qiang Autonomous County which suffered earthquake damage is particularly serious one of the county. The secondary after the devastating earthquake landslides, mudslides, landslides and other geological disasters caused heavy losses to the county,and even pose security risks to the province. In the same year on September 24th encounter in Beichuan County, once in many years heavy rains. Under heavy rainfall in the region jumped the river, flooding large areas of farmland, board room resettlement areas, washed away roads, bridges, debris flow induced by a regional. Lead to 214 geological disasters, including landslides, 72, damage to the huge transport infrastructure in some areas, electricity, or communications, direct economic losses amounted to 1.87 billion, at the same time the earthquake debris also poses a serious threat to residents of resettlement area. After the earthquake in the Chengdu Sichuan University professor Tang and his students for the many scholars after the earthquake Kitagawa County rainstorm landslides in the risk assessment study. Papers in Wang Yuejuan research, based on the first earthquake in Beichuan County regional debris flow development characteristics were analyzed and discussed, then take and Wang Yuejuan the same idea in the whole surface of the Beichuan County regional debris flow hazard assessment based on specific to a single debris flow hazard assessment;This will help to the North Sichuan throughout the county town or village planning to draw on, can be achieved in a mudslide disaster threatening the region, for the construction site and protective measures designed to help optimize.This thesis research for Wang Yuejuan analysis, learning of her ideas and methods put forward their own views, which is the main line of the paper. Wang Yuejuan paper evaluation by five sensitivity analysis, the increase in the first six indicators, namely, the size of debris flow.Channel density, lithology, precipitation, terrain slope, seismic intensity 5 factors that cover the debris flow occurred despite the geological environmental factors, reveals the possibility of debris flow and harm .But five indicators more reflect the size of the likelihood of debris flow, and the risk of debris flow should be fully considered and the likelihood of debris flow hazards, is the unity of the two, the size of debris flow can be better reflected the danger of debris flow .Therefore, in this thesis, the scale of this factor into the debris flow sensitivity analysis, apparently after the earthquake in Beichuan County Debris Flow Hazard analysis is essential.The indicators in the value of sensitivity, Wang Chuan, the paper mainly to directly assign a value that has no value, and with a great deal of subjective and arbitrary, and the various indicators that value is not uniform standards, led to the risk of divisions, the risk of the whole region North Sichuan County area of nearly 50? noticeably, and north China County in the position of the geological conditions that are incompatible. The paper used statistical models sensitivity to each indicator is a statistical analysis and sensitivity to the assignment of interpolation function to ensure that the different blocks sensitivity pointed out that the continuity of value, but also for each indicator is not a quantitative and belong to one and sensitivity of the value of more accurate and reasonable. Each evaluation indicators and to increase the weight, therefore, landslides, risk assessment on the various indicators simple overlapping, it is fully reflected the indicators in risk assessment, the role.Finally, Liu Xilin single debris flow risk calculation formula was slightly improved, whether true or not, in short, is a deliberate attempt. |
PDF Full Text Request