도시기능 복원시 LID적용에 따른 수문특성

Abstract

The management of urban stormwater has become increasingly complex over recent decades. Korea is experiencing a very rapid process of urbanization, which brings adverse impact on the water environment. As a result, urban runoff quantity and quality control has emerged as a key concern for municipal officials. One of the strategies for mitigating the impact of urbanization is the use of LID for urban stormwater runoff quality and quantity control. Before implementing the various BMPs, however, it is important, and necessary, to find the most cost-effective selection, design and placement of BMPs. Consequently, terminology describing the principles and practices of urban drainage has become increasingly diverse, increasing the potential for confusion and miscommunication. This thesis includes history, scope, application and underlying principles of terms used in urban drainage and provides recommendations for clear communication of these principles. Urbanization can significantly affect the hydrologic cycle by increasing flood discharge and heat flux. In order to mitigate these modifications in urban areas, Low Impact Development(LID) technique has been designed and applied in Korea. In order to estimate runoff reduction rate using SWMM LID model, the characteristics of five LID techniques was firstly analyzed for water balance. Vegetated swale and green roof were not reduce flood discharge nor infiltration amount. On the other hand, porous pavement and infiltration trench were captured by infiltration function. The flood reduction rate with LID is substantially affected by their structures and properties, e.g., the percentage of the area installed with LID components and the percentage of the drainage area of the LID components. The objective of this thesis is to let authority and public recognize the fundamental reason of this problem and at the same time realize the benefits of LID.