SHUILI XUEBAO km. Honolulu Weatcart Contractor Giggs. Home J. M. U. Jucson

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1 SHUILI XUEBAO Vsual Modflow 600mg / L 16. 9m 8. 3m % 1 ~ 2 P A km Honolulu Meyer Weatcart Contractor Gggs F. Ghassem SALFLOW Home J. M. U. Jucson E-mal zh4012@ 163. com 560

2 G. C. Hockng Thomas Graf 9 Thomas Graf 2006 X. Mao PHWAT 10 X. Mao 2004 Ghyben - Herzbeg Ghyben-Herzberg km 1. 4km 2km m 800 m 1. 5 ~ 5. 0 m 1. 0 ~ 2. 0 m 12 0 ~ 22m 22 ~ 460m 22m 250 ~ 300m 1250m 0. 3 ~ 2. 9m K 70m / d μ n = n e = m m 1505mm 3 561

3 3. 1 Darcy 16 ( ) K 2 H + 2 H + 2 H + Kη c x 2 y 2 2 z z c t ( ) + u c x ( ) = c D x x = S s H t + + nη c t - ρ ρ 0 q s ( c * - c) n = x 1 x 2 x 3 x y z z = 0 z x y 1 K m / d H H = Z + P / γ m P Pa γ γ = ρg N / m 3 η η = ε / c s m 3 / kg ε ε = ρ s - ρ 0 / ρ 0 ρ 0 kg / m 3 ρ s kg / m 3 c s ρ s kg / m 3 S s t d n c kg / m 3 ρ kg / m 3 q s d - 1 u m / d D m 2 / d c * kg / m 3 q s m 25m 1 1 Vsual Modflow m 10 m 2 1 0mg / L mg / L mg / L 3 562

4 19 000mg / L 3 25m mg / L 3. 2 Vsual Modflow m j k Δx j Δy Δz k Δx j Δy Δz k x y z 1 2 Δt d 2 10d 1d 2 8d d kg / m kg / m 3 35g / L c g / L 3. 3 ρ s 1 2 ρ 0 c s ~ 0. 25m m 563

5 3 Cl - 1 Cl Cl mg / L 16. 9m m Cl - 1 mg / L mm 8 235mm / mm m m V = μ j Sh f j V μ S h fj ~

6 % % 2 h / m h / m / % h / m h / m / % 1 # # # # # # # # mg / L 16. 9m 8. 3m % 1 ~ 2 1 Clark C K Lu L. Lau Stephen Mnk John F. Numercal smulaton of a thck freshwater lens Pearl Harbor groundwater model R. Techncal Report No. 139 Water Research Center Unversty of Hawa Honolulu Hawa. December Meyer C K Kleneck D C. Mathematcal modelng of fresh water aqufers havng a salt water bottom R. Tech. Rep. GE74 TEMPO43 Center of Advance Studes TEMPO General Electrc Co Weatcart S W. Numercal modelng of lqud waste njecton nto a two-phase flud system R. Tech. Rep. No. 125 Water Research Center Unversty of Hawa. Ix + 103P Contractor D N. A one-dmensonal fnte element salt water ntruson model R. Tech. Rep. 20 water Resources Research Center Unversty of Guam Gggs J E Peterson F L. Ground Water Flow dynamcs and development strateges at the atoll scale J. Ground Water

7 6 Ghassem F Molson J W Fakland A. Three-dmensonal smulaton of the Home Island freshwater lens prelmnary results J. Envronmental Modelng and Software Jucson J M U. Recharge and aqufer response Northern guam lens aqufer guam marana slands J. Journal of Hydrology Hockng G C. The lens of freshwater n a tropcal sland-2d wthdrawal J. Computers and Fluds Thomas Graf Rene Therren. Varable-densty groundwater flow and solute transport n porous meda contanng no unform dscrete fractures J. Advances n Water Resources Mao X Prommer H Barry D A et al. Three-dmensonal model for mult-component reactve transport wth varable densty groundwater flow J. Envronmental Modelng & Software J J D M Ghassem F Molson J W Falkland A. Three-dmensonal smulaton of the Home Island freshwater lens prelmnary results J. Envronmental Modelng & Software M Jocson M U Jenson J W Contractor D N et al. Recharge and aqufer response Northern Guam Lens Aqufer Guam Marana Islands J. Journal of Hydrology Fslkland A. Hydrology and water resources of small slands a practcal gude M. UNESCO Imprmere de Manutenton Mayenne France M J Three-dmensonal numercal smulaton of freshwater len n coral slands ZHOU Cong-zh HE L YANG Qn FANG Zhen-dong Logstc Engneerng Unversty Chongqng Chna Abstract Freshwater lens s the precous freshwater resources n coral slands. A three-dmensonal freshwater lens model was developed to smulate the dynamc characterstcs and effects of ranfall on the freshwater lens n the Yongxng Island. Wth fnte dfference method and the Vsual Modflow package the model was solved numercally based on the hydrogeologcal parameters obtaned from experment and n-stu survey. The water flow drecton water head dstrbuton transton area thckness and the freshwater storage n the lens at dfferent tme were obtaned. Takng the soconcentraton surface of Cl - 1 wth 600mg / L as the nterface of the lens the maxmum thckness of the lens n the sland s 16. 9m wth the transton area thckness of about 8. 3m. The lens reaches ts mnmum storage n Aprl and maxmum n September and the storage n September more than that n Aprl. Comparng wth the change of ranfall n a year the change of freshwater storage s lagged 1 to 2 months. By means of the proposed methods the explotaton strategy of safely and sustanably developng the freshwater lens can be worked out. Key words coral sland freshwater lens mathematc model 566

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