凍土退化 的英文怎麼說
中文拼音 [dòngtǔtuìhuà]
凍土退化
英文
permafrost degradation-
The first geologic reason for degeneration of the eco - environment in the headwater area of the yellow river is that the increase of the recent geologic function caused desertification and grasslands resource decreased and underside changed, destroied the balance of water - air - heat in the area ; the second is that the water environment changes by the degradation and atrophy of frozen earth cause multilayer and synthesis cause of formation degeneration of the eco - environment ; the third is that the man and rats function accelerated degeneration of the eco - environment in the headwater area of the yellow river
摘要黃河源區生態環境惡化的地質原因之一是現代地質作用增強，形成以荒漠化為主的草地資源退化與下墊面改變，地區水氣熱平衡破壞；二是因凍土退化、萎縮，引起水環境變異，導致多層面與綜合成因的生態環境惡化；三是人為及鼠類活動對源區生態環境惡化起著推波助瀾的作用。The results demonstrate that the upper limit of permafrost in this area had declined from 1970s to the middle phase of 1990, and permafrost has appeared degenerate tendecy, but since middle 1990s, permafrost have a stable state ; ground temperature of roadbed near the earth surface is higher than that of the natural ground, thawing time of roadbed near the earth surface is longer than that of the natural ground, the heat income within the permafrost is greater than the heat release from the permafrost during anannual period, the heat accumulation within the permafrost is temporarily appeared as temperature rising, but with the heat accumulation within permafrost growing up year by year, permafrost temperature will become higher gradually, and strong thawing of permafrost could be happened in the region
結果表明：風火山地區從20世紀70年代到90年代中期凍土上限下降，凍土出現退化現象，從90年代至今凍土趨于穩定；路基近地表地溫明顯高於對應天然地表下的地溫，路基近地表經歷的融化期長于對應天然地表，進入多年凍土區的熱收支也呈現出吸熱明顯大於放熱的周期性變化，進入多年凍土的熱積累暫時以增高地溫耗熱為主，但隨著凍土吸熱量的逐年積累、凍土溫度的不斷升高，本區凍土可能發生強烈融化。We are already seeing changes in rainfall ; an increase in the frequency and severity of extreme weather events ; melting sea ice and permafrost ; retreating glaciers
氣溫不斷升高，降水量開始改變，極度惡劣的天氣情況愈加頻繁，破壞力也更大。海平面的冰塊開始溶化，永久凍土也開始解凍，冰山開始消退。Because of regional underground water level continual dropping and climate changing to aridity, land desertifacation and degeneration of glassland and tundra will tend to worse in short period
由於區域地下水位的持續下降和氣候向乾旱化發展，土地沙化、草場退化及多年凍土退化短期內將趨于惡化。The effect of such factors, as the frozen soil degradation, the soft effect of restraints of soil to bridge foundation, on the safety and seismic response of railway bridges are considered and simulated
結果表明，當凍土退化而導致地基嵌固作用降低時，橋梁墩身的地震彎矩減小，樁身彎矩和墩頂位移增大。分享友人