Summary of doctor of engineering: Study identified a number of parameters of rain contribute to improve traffic formula designed small drainage structures on roads in Vietnam

Engineering PhD thesis: Study identified a number of parameters of rain contribute to improve traffic formula designed small drainage structures on roads in Vietnam climatic conditions for theoretical research, analysis essence, the proposed principles, methods, formulas determine the parameters of rain used in the flow calculation formula designed small drainage structures on roads in Vietnam conditions.
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Summary of doctor of engineering: Study identified a number of parameters of rain contribute to improve traffic formula designed small drainage structures on roads in Vietnam MINISTRY OF EDUCATION & TRAINING UNIVERSITY OF TRANSPORT AND COMMUNICATIONS Nguyen Anh Tuan STUDYING THE DETERMINATION OF A NUMBER OF RAINPARAMETERS TO MAKE CONTRIBUTIONS TO COMPLETING THEFORMULA OF DESIGN FLOW OF SMALL SIZED DRAIN WORKS ON ROAD UNDER THE CLIMATIC CONDITIONS OF VIETNAM Major: Building auto road and city road Code: 62.58.30.01 SUMMARY OF DOCTOR OF ENGINEERING -2- Hanoi-2014 PREAMBLE1. Background for the research. Today, the transportation network has been expanding; urban areas,industrial zones have been developed at a rapid pace. We require aformula to calculate the design flow for simple, easy-to-calculate smalldrainage structures with the acceptable accuracy. In recent decades, Vietnam has been seriously affected by the climatechange phenomenon, increasing the extreme climate phenomena,affecting the rainfall regime in Vietnam. Therefore, it affects the rainfallparameters used in calculating the design flow of drainage works on theroad Qp. The use of the research results, previous rainfall data incalculating Qp becomes the reduced reliability, with large errors, givingrise to the damages to works, delaying the transport, increasing costs ofrepairing and maintaining, affecting the living environment… This clearly shows the reality out of the practice, such as thephenomenon of damages to small drainage works on the road due toincreasing flood; damages can occur immediately or only a few yearsafter being put into use; phenomenon of water storage at the upstreamcauses flooding to the fields and villages, affecting the agriculturalproduction often occurs in the Central Region after completing theconstruction of roads; the phenomena of street inundation after the heavyrains in some urban areas of Vietnam makes difficulties, disturbance foractivities and production. . . Obviously, there are outstanding problems,emerged problems of determining the rainfall parameters in formula ofcalculating Qp of small water drainage works on the roads in Vietnamtoday. -3- From the above urgent requirements, the dissertation has beenselected for the research.2. Research objectives. - Theoretical research, analysis of nature, proposing principles andmethods, formula for determining the parameters of rain used in theformula of calculating design flow of small drainage works on roadsunder the conditions of Vietnam. - Applying into the practice: immediately, because there has not beenenough conditions, targets of determining specific valuation ofparameters on rainfall at 12 typically selected meteorological stations,these values are proposed for reference to the practical use in calculatingdesign flow of drainage works on roads in these areas of Vietnam.3. Research contents. - The thesis focuses on researching and resolving rain parameters.This is the decisive, important and indefinite parameters in calculating Q pof small drainage works on the roads, totally depending on the particularcharacteristics of the climate in Vietnam. The rainfall parameters of theresearch are as follows: +) The study shall determine the calculated daily rainfall H n,p at adesign frequency tailored to the characteristics of the weather changes inVietnam. +) The study shall identify specific factors of the rain shape ΨT andissues of rain zoning in line with the requirements on calculating designflow of small drainage works on the roads in Vietnam. +) The study shall determine parameters on the designed rainfallintensity aT,p, corresponding to the concentration time of designed waterand design frequency. Calculated rain intensity parameters a T,p is thegeneral impact parameter in calculating design flow of drainage works onthe roads. - The above are the parameters on rain used in the formula ofcalculating design flow of drainage works on the roads.4. Research methods. Statistical analysis is the main method used in the thesis.5. Scientific meanings and pratice of the project. -4- - Researching characteristics of rainfall changes, contributing tofurther elucidate the unusual situation of change of rain in the territory ofVietnam in recent decades. Realizing the urgency to recalibrate orgradually replace the new database of rainfall in line with the weatherphenomenon under the affects of the climate changes; suggestingsolutions to coping with the phenomenon of radical changes in rain incalculating design flow of water drainage works on the roads in Vietnamtoday. ...