泥石流与人类经济活动

山地是泥石流与人类共存的环境，泥石流作用于山地环境，强烈地影响人类经济活动：人类经济活动也作用于山地环境，强烈地影响泥石流。泥石流对山地环境的危害，主要为破坏地表、破坏生态系统和淤堵江河；泥石流对人类及其经济活动的危害，主要为破坏城镇，村庄，工矿，交通水利水电工程，农田和人类自身的安全。泥石流危害的结果，能导致山地坡面破碎化、沟口沙石化、河床宽浅化和植被逆向演替化，以及耕地贫瘠化、经济发展滞后化和

DEBRIS FLOW,AND HUMAN ECONOMIC ACTIVITIES

Mountain area is place where debris flow is coexisting with humankind.Debris flow acts on mountain environment and strongly affects economic activities while human economic activities act on environment as well and intensely affect debris flow. Debris flow does harm to mountain environment in destroying the earth's surface,wrecking ecosystem and silting up rivers.Debris flow does harm to human and their economic activities in destroying cities,towns,villages,factories,mines,roads,irrigation and hydropower works,farmland and the safety of human self.The consequences of debris flow damage are the following:slope is broken,a great number of debris are brought to gully outlets,riverbeds are broadened and made shallow,vegetation conditions are deteriorated.Degbris flow endangers economic activities by making farmland impoverished and regional economy depressed. To a certain extent,evolution of mountain environment and debris flow are influenced by human economic activities.Economic activities should follow natural law and develop natural resources moderately in mountain area,otherwise such activities will degrade mountain environment,increase activity of debris flow and change the regularities of debris flow hazards. Mountain environment and hazards (for example,debris flow,etc.) must be understood correctly and countermeasure to control hazards be taken properly for the existence and development of human race.Mountain environment,debris flow and human economic activities are closely related and interacting.Humankind plays a leading role in the interactions,hence it is initiative.Debris flow harm will be controlled and the coordinate development of economy and mountain environment will be possible so long as the economic activities abide by natural laws.