مدل سازي تلفيقي آب هاي سطحي و زيرزميني در هيدروسيستم هاي پيچيده

چكيده انگليسي :

Surface Water and Groundwater Interaction Modeling in the Complex Hydrosystem Maedeh Yazdani Pour yazdani@cv iut ac ir 6 April 2009 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiDr Hamid Reza Safavi hasafavi@cc iut ac ir Abstract Water resources interaction modeling is a mathematical modeling of surface and groundwater flowinteraction that demonstrates interactions between surface water and groundwater with considering othereffective parameters such as recharge discharge and system exchanges This type of modeling can play animportant role in the management and integrated utilization of water resources In this research modeling ofcomplex hydrosystem have been studied specially modeling the interaction among river multi networkirrigation and drainage channels and multi layered aquifer system that contains confined and unconfinedaquifers In this research Koohpayeh Sagzi subbasin located in Zayandeh Rood river basin with complex physicalstructures have been selected as a case study The physical conditions governing equations of surface andgroundwater flow interaction effective parameters in interaction process consideration of related effects inmodel and limitations of modeling have been studied to present conjunctive simulation model according to thestructure of Groundwater Vistas Version 4 GV4 model for a practicable case GV is a unique groundwater flowmodeling that couples a powerful model design system with comprehensive graphical analysis tools GV is agraphical design system for MODFLOW and other similar models such as MODPATH and MT3D The mainmodel in this modeling is MODFLOW that is a modular three dimensional finite difference groundwater flowmodel The conceptual model of subbasin has been determined with reviewing subbasin and geology maps digitalelevation maps DEM satellite images of the subbasin and data of exploration wells pisometers pumping wellsand irrigation networks data with using geographic information systems GIS as a lateral tool According to theconceptual model a simulation model with three layeres was established first layer as a unconfined aquiferrepresenting surface aquifer second layer representing impermeable layer and third layer as a confined aquiferrepresenting subsurface aquifer The boundary conditions of this model include specified flux and mixed typeboundary conditions Specified flux condition has been applied in cells of no flow wells and recharge the latterflux in GV is actually defined as a parameter Mixed type boundary condition has been used in cells of river andgeneral head boundaries Different parameters such as hydraulic conductivity storage coefficients includingstorage and specific yield layer top and bottom elevation have been defined for this modeling using the zonedatabase or using a matrix of values The conjunctive simulation model has run in both steady and unsteady states and has calibrated in differentsteps and results of calibrated have been studied in sensitivity analysis GV assists model calibration in threeways 1 calculation of calibration statistics for head drawdown concentration or flux 2 automated parametersensitivity analysis 3 automatic model calibration using a nonlinear least squares technique built right into theGV interface or using external inverse models such as PEST UCODE and MODFLOW2000 In this modeling calculation of calibration statistics for hydraulic head automatic sensitivity analysis and MODFLOW2000 inversemodel have been used to calibrate the model Finally hydraulic behavior of hydrosystem has been determined and hydraulic head values flux and massexchanges hydrodynamic coefficients of surface and subsurface aquifers infiltration factors in recharge anddischarge zones and other parameters have been calculated in steady and unsteady models It is considerable inall of modeling steps surface water and groundwater interaction has been assumed in saturated zone Key WordsInteraction modeling

يزداني پور، مائده

مدل سازي تلفيقي آب هاي سطحي و زيرزميني در هيدروسيستم هاي پيچيده

اندر كنش , مدل شبيه ساز