A Stream-aquifer three-dimensional groundwater flow model

الملخص EN

-This paper di scus ses the proper way to describe the important st rea m-aq uife r interactio n bo undary co ndi tio n.

to repres ent the ef fec t of a stream on a n aquifer.

It also shows th e incorporati on of the stream -aquifer boundar y o r third type boundar y condi tion in a cu rviline a r coordinat e three-dimensional groundwater flow model.

The mod el is tested by a comparison with the simple pr obl em of a pumping well nc a r a pe renni al strea m full y pe net rating the aquifer.

T he numerical mod el shows a goo d agree me nt with the ana lytica l so lution for both tran sient and stead y st ate condit ion.

Addition ally .

the model is then applied to the sa me system bu t without th e ass umpt ion offully penetra ting well an d st ream by using both the rea ch transmi ssivit y co ncept and the three-dimen sion al re present ati on of the aq uife r system.

Th e comparison shows a large deviati on betwe en the analytical solution and the numerical represen tati on es pec ia lly for th e calcu lat ion of th e re tu rn flow .

which can be a ttr ibuted to the ef fec ts of the boundar y co nd itions o n the resul ts of the num eri cal mod el.

Th e mod el proved to be working acc ura te ly in compariso n with the ana lytica l solution _but the estimation of the reach tra nsmissivity ne ed s to be inves tigat ed furt her to show its effect on the ca lcula tion of the re turn flow .