CAJ | 학술논문

据苕溪流域现有的地层学、考古学、地方志等资料考证，其河道变迁可追溯至晚更新世末，演化过程具有阶段性：1）18—15 ka BP，苕溪河道剧烈下切，东、西苕溪独流入海，西苕溪顺地势东北流入海，东苕溪东流入杭州湾；2）15．0—7．5 ka BP，苕溪河道下切能力减弱，沉积作用加强，东、西苕溪独流入海．8．7 ka BP以前，西苕溪流进钱塘谷地后注入杭州湾，8．7 ka BP之后，西苕溪流进古太湖湾；3）7．5—4．0 ka BP，苕溪河道沉积作用明显，河口发生淤积，5．0 ka BP以前，东、西苕溪独流入海，5．0 ka BP之后，西苕溪流入古西太湖，东苕溪在余杭东改道北流，入一泻湖，并在5．0—4．0 ka BP期间3次大规模改道；4）4．0 ka BP以来，苕溪河道沉积作用明显，东、西苕溪合流入太湖，且中下游段改道频繁．苕溪河道变迁始终与本区地理环境演化密切相关，包括对海面升降变化的响应、与太湖发育及古地形演变等的互动．
거초계류역현유적지층학、고고학、지방지등자료고증，기하도변천가추소지만경신세말，연화과정구유계단성：1）18—15 ka BP，초계하도극렬하절，동、서초계독류입해，서초계순지세동북류입해，동초계동류입항주만；2）15．0—7．5 ka BP，초계하도하절능력감약，침적작용가강，동、서초계독류입해．8．7 ka BP이전，서초계류진전당곡지후주입항주만，8．7 ka BP지후，서초계류진고태호만；3）7．5—4．0 ka BP，초계하도침적작용명현，하구발생어적，5．0 ka BP이전，동、서초계독류입해，5．0 ka BP지후，서초계류입고서태호，동초계재여항동개도북류，입일사호，병재5．0—4．0 ka BP기간3차대규모개도；4）4．0 ka BP이래，초계하도침적작용명현，동、서초계합류입태호，차중하유단개도빈번．초계하도변천시종여본구지리배경연화밀절상관，포괄대해면승강변화적향응、여태호발육급고지형연변등적호동．
The channel changes of Tiaoxi River was divided into four stages which could be traced back to the end of late Pleistocene.Evidences from stratigraphy, archaeological, local chronicles from Tiaoxi River basin showed that:1)during 18 ka BP to 15 ka BP, Tiaoxi River′s channel incised deeply because of sea level fall-ing, West Tiaoxi River and East Tiaoxi River flowed into the east sea and Hangzhou Bay respectively.2 ) Tiaoxi River′s channel weakened its incision and enhanced its deposition from 15.0—7.5 ka BP.Its branches flowed into the sea alone during that period.The West Tiaoxi River flowed into the Hangzhou Bay before 8.7 ka BP, then it flowed into the ancient Taihu Bay.3)the deposition of the Tiaoxi River increased sighificantly, and there used to be estuarine sedimentation from 7.5 ka BP to 4.0 ka BP.East Tiaoxi River and West Tiaoxi River still flowed into the sea alone before 5.0 ka BP, West Tiaoxi River flowed into ancient West Taihu Lake after 5.0 ka BP.East Tiaoxi River changed its channel in the east of Yuhang, then flowed north into lake which was located in Taihu Plain.There had been several large-scale channel changes of the East Tiaoxi River from 5.0 to 4.0 ka BP.4) the deposition of the Tiaoxi River was evident during the last 4 000 years.West Tiaoxi River and East Tiaoxi River were joined together, and flowed into Taihu Lake finally.The mid-lower re-gions of Tiaoxi River often changed its channels.In addition, the channel changes of Tiaoxi River was always related to the special geographical environmental evolution in this area which included the sea level changes, the evolution of Taihu Lake, the paleo-geomorphologic evolution, etc.