| High-grade highway can shorten the distance of city from city or from country, which is an engineering to strengthen their relationship. Highway is characterized by continuous line, this feature revealed that highway must go through the nature ecologic system along its line, so the construction of highway must have influence on ecologic environment and nature resources. This affection includes two aspects, the one is active for ecologic environment development, the other one is negative, such as the division of ecologic system, the occupancy of lands, the fluiding and losing of water and soil, the changes of hydrologic condition, the destroy of forest and vegetation, the pollution of air and water, and so on. But we can make decision scientifically, change design ideas, carry out environmental proof, regulate laws and strengthen traffic management to avoid the negative influence. So highway engineering can be developed coordinatively with ecologic environment.In China, the systemic study about the coordinative development has been done, but it is not enough, so this study has a great meanings for highway engineering's sustainable development. In this paper, the relationship of high construction with ecologic environment is discussed, the basic way and idea about the coordinative development are presented, the structure and function of ecologic system along lines are analyzed. According to the principle of ecology, the changes of influence factors on ecologic system are studied quantitily. The synthetic index method for evaluating highway program's ecologic system is put forward. The right values of influence factors are calculated so as to compute the program's influencing degree, its formula is At last, the design rules and methods for protecting ecologic environment along lines are derived.The result of this study will be for reference to the ecologic environmental assessment and ecologic protection for Chinese highway items . |
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