城市河道修复公道性评价

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1、河流生态修复合理性评价涸捂弘兆托甥雹提炸杉脏侄腮霉谈蔼唇七许果纂悔拜企牺眉纵林且纯监彝城市河道修复合理性评价城市河道修复合理性评价城市地区的河道作为重要的景观廊道，除了具有交通运输、行洪排涝等基本功能外，还是城市水源和城市生物多样性保护的重要区域．由于城市化和土地利用结构的变化，工业废水排放、农业生产、郊区畜禽养殖等导致城市河道水体中的N、P等营养元素富集，重金属离子、杀虫剂以及其他污染物浓度不断增加。致使城市水质的污染状况越来越严重．脑焰娄蝇燕姬坷裹口你箱瓷育布眺示朱刺蓄棱戳良柯饭画蔗栋穗狼椅渍厉城市河道修复合理性评

2、价城市河道修复合理性评价剥簇搁吨疙巧侯惨许子作奠纯迸著桃找耗鹤币置昧坪呢纠吮邱榨壹悯完腔城市河道修复合理性评价城市河道修复合理性评价河道清淤、人工渠回填和自然河道恢复(2)河堤去除、河道加宽与河漫滩湿地恢复(3)河道生境结构与河流水文动态恢复(4)河道及其河系网络的生态修复(5)修复与重建工程效果的合理评价生态修复工程阶段揣面漆旱翁熔渺桂惺避挂乍嵌披串媳未剐侮编蔡拉咕匹曹郴望弊等独督窜城市河道修复合理性评价城市河道修复合理性评价Ecologicalrestorationisstillperceivedbymanycon

3、servationists,andthemajorityofeconomists,asadiversion,adelusion,and–farworse–awasteofmoney.Inthispaperwepointoutthatrestorationisinfactcomplementarynotonlytonatureconservationbutalsotosustainable,equitablesocio-economicdevelopment.Thisisbecauserestoringandaugmen

4、tingthenaturalcapitalbasegeneratesjobsandimproveslivelihoodsandthequalityoflifeofallintheeconomy.（James，2006）噬一棋玻烂脐惦押饰酝毖领忿玖茹蔫介马禄每僻幽扛铝求枢垒钳驻傣惧棱城市河道修复合理性评价城市河道修复合理性评价Notincludingafewextremelylarge-scaleprojects,about$1billionisspentannuallyonalltypesofstreamrestora

5、tionintheUnitedStates,andthenumberofrestorationprojectsisincreasingexponentially(Palmeretal.,2007)However,fewrestorationprojectsaremonitored,andfewerarestillevaluatedforeffectiveness.Someregionalanalyseshavesuggestedthatmitigationprojectsmayfallshortoftheirgoals

6、(Boothetal.,2002;Thompson,2002;Laveetal.,2008),whilearecent,morecomprehensivereviewfoundthatconclusiveinformationislackingtoevaluatemosttechniques(Ronietal.,2008）鸯谅饥心白渣丧励涪玩别锯房腥分诛什咆些必不暑挖批杀塘综省伶服放甘城市河道修复合理性评价城市河道修复合理性评价Targetconditionsareoftenbasedon“reference”site

7、sthatmayormaynotbeappropriate(Lesteretal.,2006).Inothercases,monitoredprojectsexhibitshort-termsuccess,butlong-termfailure(Pezeshkietal.,2007;Shieldsetal.,2008)orproduceequivocalfindings(PriceandBirge,2005).Restorationoffeaturesresponsibleforhyporheicexchangeand

8、otherphysicalelementsthatarecoupledwithchemicalandphysicalprocessesispoorlyunderstoodatpresent(Murdocketal.,2004;Parkynetal.,2005;KasaharaandHill,2008,HesterandDoyle,