Evaluation And Solutions For Harmony Between Landscape And Environment Of Scenic Highway

With the social development, the needs of highway go up from the transfers of people and goods to the demands of traffic safety and the requirements of the beauty and comfort of road landscape environment. The requirements of traffic safety, landscape of road area and ecological environment are much harsher for the scenic highway especially the mountain scenic highway area due to its geographical location. At present, too much emphasis was laid on the scenic highway capacity, the inadequate concepts of environmental protection and the landscape designs. As a result, natural and human landscape was severely damaged and there exists huge security risk. The study on the harmony between scenic highway landscape and environment is not only the new era idea on the road design and construction which is "the insistence on the harmony between human beings and nature, the respect for nature and the protection of environment", but also promotes scenic highway traffic safety level, and realizes the purpose of the sustainable development. How to improve the landscape coordination of mountain scenic highway has become a serious problem.This paper, based on the western transportation construction projects of the Ministry of Communications——"Reconstruction and Security Technology Research on Xiangxi Scenic Highway", has studied on harmony between environment and landscape of scenic highway, put forward the coordination of dcenic highway landscape quantitative evaluation index system, built a deviation based on evaluation model, and carried out the research of coordinated landscape design as well as the key technology of design process based on the concept and principles of coordinated design.Some concepts and theories were illustrated in detail, which are related to highway landscape coordination, such as highway landscape, landscape coordination, road ecology and basic principles of landscape design. The definition of the landscape coordination of scenic highway is put forward, that is status and changes in the highway landscape can improve the safety of highway operations, increase visual aesthetics, and reduce disturbance to ecological environment and the extent of damage.With the research of the landscape status along the Xiangxi highways, this paper investigated the scenic highway landscape, including side slope, retaining wall, side ditch and other aspects. Some conclusions of investigation were obtained as follows. Firstly, it’s usually failed to develop and take advantage of the natural landscape which has appreciated value. Secondly, during the construction of highway, environment may had been impacted and damaged in some extent. Thirdly, when construction completed, there were no effective measures of highway planting, result in poor coordination between highway landscape and natural environment.Aims at studying the coordination between landscape and environment of scenic highway, the indicators system of landscape coordination evaluation are constructed with following steps. First of all, the indicators were selected based on Target Decomposition Method. Secondly, the unsuitable indicators were screened out by experts with the Delphi Technique. Thirdly, the constitution was optimized after individual tests and system tests.A combined weight model had established to determine the weight distribution of evaluation index system of the harmony between landscape and environment of scenic highway. In this model the index weight consists of two parts, the amount of value weight and the amount of information weight.A combined evaluation model of scenic highway landscape, based on the deviation of a single evaluation and combined advantages of different evaluation methods, was established to get more accurate and reasonable comprehensive value of landscape coordination of scenic highway.It is researched that key technologies of coordinated design of scenic highway landscape including the design of slope, retaining wall, side ditch, quarry and dump site and viewing platform, based on the evaluation and design principle of the scenic highway landscape coordination. The design process of scenic highway landscape coordination was proposed, which included the proposing objectives, the landscape investigation, the landscape coordination assessment, the landscape design, the landscape construction, the landscape post evaluation, the landscape operation and the maintenance. The efficiency and quality of the landscape coordination design had been improved obviously by the interacting of theory and practice.Finally, the evaluation and design research results of the scenic highway landscape coordination were applied to engineering practice, relying on the scenic highway from Li Xian to Xiaojin Xian in Sichuan province. The results showed that the landscape coordination of the village section was "good", and the forest landscape coordination segment was "moderate". According to the coordination assessment results, this paper has put forward the landscape coordination improvements of "LiXiao Road".