学科分类
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26 个结果
  • 简介:Inthecourseofworldindustrialization,resourceshavebeenreducedandenvironmentisdeteriorating.Thisresultsfromtwofactors.Oneisgrowthofworldpopulation.Worldpopulationwentupto1billionin1800,2billionin1930;accordingly,itcost130yearstogrow1billion.Andthen,itreached3billionin1960,4billionin1975,5billionin1987and6billionin1999.Intheperiodof1960-1999,

  • 标签: 西部地区 资源开发战略 中国 可持续发展 生态环境 资源利用率
  • 简介:Chinaisoneofthecountrieswiththemostseriousfloodingdisasters.InChina,above70%ofbigcities,50%ofpopulationand75%ofindustrialandagriculturaloutputvaluearedistributedineasterncoastalareaswithseriousflooding.Therefore,enhancementoftheoreticalstudyandexperiencesummarizationofurbanfloodcontrolisofgreattheoreticalandpracticalsignificance.Aseconomyisdevelopingrapidly,urbanscaleisexpandingfast,andurbanfloodcontrolstandispromoted.Urbanfloodcontrolcallsfornewconceptandmethods.Thispapermakesasystematicsummarizationofconceptevolutionandadvancedmethodsconcerningurbanfloodcontrolathomeandabroad.Theconceptofurbanfloodcontrolhastransformedfromsimplefloodcontrolanddrainagetocoexistencewithanduseofflood.Floodcontrolmeasureshavetransferredformemphasisuponengineeringonestoprioritytobothengineeringandnon-engineeringones,withspecialattentiontoecologicalfloodcontrol,suchasmakingfulluseofecologicalrevetment,ecologicalrealignmentofariver,multi-objectivemanagementofurbanflooddetentionregion,turningfloodintoresourcesandutilizationofwetlands.

  • 标签: 防洪策略 大城市 城市防洪 洪水 人力 基础