南水北调与水利科技
南水北調與水利科技
남수북조여수리과기
SOUTH-TO-NORTH WATER
2014年
3期
17-23
,共7页
武周虎%付莎莎%罗辉%刘长余%赵培青%hui%LIU Chang%yu%ZHAO Pei%qing
武週虎%付莎莎%囉輝%劉長餘%趙培青%hui%LIU Chang%yu%ZHAO Pei%qing
무주호%부사사%라휘%류장여%조배청%hui%LIU Chang%yu%ZHAO Pei%qing
南水北调%南四湖%输水流场%数学模型%输水航道%开挖疏浚
南水北調%南四湖%輸水流場%數學模型%輸水航道%開挖疏浚
남수북조%남사호%수수류장%수학모형%수수항도%개알소준
South2North-Water-Transfer%Nansi-Lake%flow-field-of-water-transfer%mathematical-model%main-channel-of-water-transfer%excavation-and-dredging
由于南四湖错综复杂的地形变化和湖盆特征,若采用传统一维总流计算法进行湖内开挖疏浚工程的水力计算,将会影响输水工程的可靠性。因此,以南四湖万分之一地形图( CA D版)和卫星遥感影像资料为基础,创建了南四湖深度平均平面二维水流数学模型体系,并进行了模型验证。在南四湖调水设计方案条件下,开展了上、下级湖二维流场的数值模拟试算,确定了同时满足正常设计和特殊干旱运行控制点水位要求的最小规模开挖方案。流场分析表明,南四湖输水时上、下级湖全湖区在水位差的作用下呈现由南向北流场方向的单一性特点；主航道平均流速为0.12 m/s,一般高于非主航道区一个数量级左右；输水主航道平均流量比例为61.5%,最大可承担88.9%,说明南四湖湖内主航道承担着主要输水功能。
由于南四湖錯綜複雜的地形變化和湖盆特徵,若採用傳統一維總流計算法進行湖內開挖疏浚工程的水力計算,將會影響輸水工程的可靠性。因此,以南四湖萬分之一地形圖( CA D版)和衛星遙感影像資料為基礎,創建瞭南四湖深度平均平麵二維水流數學模型體繫,併進行瞭模型驗證。在南四湖調水設計方案條件下,開展瞭上、下級湖二維流場的數值模擬試算,確定瞭同時滿足正常設計和特殊榦旱運行控製點水位要求的最小規模開挖方案。流場分析錶明,南四湖輸水時上、下級湖全湖區在水位差的作用下呈現由南嚮北流場方嚮的單一性特點；主航道平均流速為0.12 m/s,一般高于非主航道區一箇數量級左右；輸水主航道平均流量比例為61.5%,最大可承擔88.9%,說明南四湖湖內主航道承擔著主要輸水功能。
유우남사호착종복잡적지형변화화호분특정,약채용전통일유총류계산법진행호내개알소준공정적수력계산,장회영향수수공정적가고성。인차,이남사호만분지일지형도( CA D판)화위성요감영상자료위기출,창건료남사호심도평균평면이유수류수학모형체계,병진행료모형험증。재남사호조수설계방안조건하,개전료상、하급호이유류장적수치모의시산,학정료동시만족정상설계화특수간한운행공제점수위요구적최소규모개알방안。류장분석표명,남사호수수시상、하급호전호구재수위차적작용하정현유남향북류장방향적단일성특점；주항도평균류속위0.12 m/s,일반고우비주항도구일개수량급좌우；수수주항도평균류량비례위61.5%,최대가승담88.9%,설명남사호호내주항도승담착주요수수공능。
Due to the complex terrain changes and characteristics of Nansi Lake Basin, the reliability of w ater transfer project can be af2 fected if the traditional one2dimensional total flow method is used in the hydraulic calculation of dredging project in the lake. In this study, a depth2averaged two2dimensional mathematical flow model system of Nansi Lake was created and verified on the basis of 1/10000scaletopographicmap(CADversion)andsatelliteremotesensingimagesofNansiLake.Undertheconditionsofdesignwater transfer scheme, the flow fields of the upper and lower Nansi Lake were simulated using the two2dimensional mathematical model. The dredging program w ith the smallest amount of excavation was determined in order to meet the requirements of water level at control lo2 cations under both normal design and special drought conditions. Analysis of the flow field results indicated that the flow field in the whole lake, both in the upper and lower lakes, showed solo2directional feature from south to north during the process of water transfer. The average flow velocity in the main channel w as 0. 12 m/s, generally about one order of magnitude higher than that in the non2main channelregions.ThemainchannelofNansiLakeplayedthemajorroleinwatertransferasitsaverageflowrateaccountedfor61.5% of the total flow rate and its maximum capability can reach 88. 9%.
