The spatial and temporal coupling of precipitation , air temperature and strong wind result in severe wind erosion in spring and winter seasons and land degradation 降水、氣溫和大風(fēng)在時(shí)空上耦合,造成了冬、春季嚴(yán)重的干旱、風(fēng)沙侵蝕和土地退化。
Main content in simulation is the spatio - temporal evolution of the set of descriptive variables characterizing tectonic mineralization state under coupling of various processes as following : ( 1 ) variables related to forming and property of ore - forming fluid , such as dissolution rate of minerals ( include metal minerals ) in rock , concentration and saturation of aqueous species in fluid , temperature , pressure , and ionic strength etc . ; ( 2 ) variables related to structural deformation and fluid flow , such as stress , deformation rate , fracture network , porosity , fracture permeability ; ( 3 ) variables related to precipitation and mineralization , such as nucleation rate of gangue and metal minerals , accumulation precipitation of various minerals , etc . ; ( 4 ) spatio - temporal coupling relation of various variables above , such as the coupling relationship between spatio - temporal evolution of fracture permeability and flow and focus of fluid and ore - forming 模擬的主要內(nèi)容是在各種過程耦合作用下,以下描述構(gòu)造成礦體系的主要變量的時(shí)空演化:與成礦流體的形成和性質(zhì)有關(guān)的變量,如地層中礦物(包括成礦物質(zhì))的溶解速率、流體中各組分的濃度與飽和度、流體溫度、壓力、離子強(qiáng)度等;與構(gòu)造變形和流體運(yùn)移有關(guān)的各變量,如應(yīng)力與變形速率、巖石孔隙度、構(gòu)造(斷裂)滲透率等;與沉淀成礦有關(guān)的變量,如礦物(金屬礦物和脈石礦物)的成核速率、各礦物的沉淀量等;上述各有關(guān)變量間的時(shí)空耦合關(guān)系,如斷裂滲透率時(shí)空演化與流體流動(dòng)、匯聚和成礦的耦合關(guān)系等。
The research indicates that the climate character which is the temporal coupling of aridity , lack of rain and excessive wind , together with the thick sand matter sediment of the west liao river system , lead to the frangibility of environment in keerqin sandlot . in the recent years , there is a seriously lack of water resources . about 50 p 研究表明:該地區(qū)氣候特征表現(xiàn)為干旱、少雨、多風(fēng)在時(shí)間上的耦合,加之西遼河水系巨厚的沙物質(zhì)沉積,構(gòu)成了科爾沁沙地生態(tài)環(huán)境的脆弱性’ o近些年來,水資源嚴(yán)重短缺,由于降水減少和不斷采集地下水,近50的湖、泡己干涸。