| The bearing capacity of the coastal zone environment is limited. The economicalgrowth and the population increase cause the pressure of the coastal zone environmentto increase. The environment tend to worsen, and protection of the coastal zonegeology environment reasonably develops the use of coastal zone ground waterresources. Thus the realization of sustainable development of social economy incoastal zone is the task facing us. So far, the Beihai city water supply still only theground water, altogether had mining well 242, mining quantity 152,300 m3/d, in theHaicheng water source and the Hetang village water source two centralisms miningland sector, the mining quantity occupies always mines the quantity about 58%, butallows the mining quantity only to account for the total quantity 22%, therefore, howmaximum limit mining ground water resources, also controls the question in thecertain degree which the sea water invasion is urgently awaits to be solved.This paper take Beihai 1985 ~ 2004 the phreatic water surface and the waterquality yearbook as a foundation, through the utilization hydrochemistry graphicmethod, the graph law, the isotope method, the analog computation and so on themany kinds of hydrology geochemistry research technique, has carried on theexhaustive analysis from the different angles to the Beihai' ground water in the timeand the spatial evolved characteristic, has moved the field of force and chemistry fieldchange to the for many years ground water has conducted the research, through thesimulation analysis, the water-rock interaction which possibly occurs to has made thepreliminary discussion.Beihai is small to the diving mining quantity overall, the ground water dynamicfield maintain the nature on the whole;The confined water is the Beihai ground watermain mining position, in the beginning of the 90's, the confined water flow fieldmajority of is at the nature, the water mark between 0 ~ 10m, after 1992, the Hetangarea water source appears take the ZK8 well as the central falling of water tablefunnel, the water level falls about deep 1 m, the area is 0.49 km2, the scale expandsunceasingly, in 1994, expanded to 31.20 km2. After 1995, the Longtan water worksmovement, the water level only then has the rise, descends the funnel to have thetendency which the scope reduces.The Beihai ground water belongs to the low TDS, the low degree of hardness,the meta-acid ground water, north local TDS low, various ions content low moreoveris stable, hydrochemistry type by Ca·Na-HCO3·Cl primarily;South the area has thephenomenon which the sea water invades, but the whole sails upstream the chemicalcomposition is quite stable, hydrochemistry type by Na·Ca-Cl·HCO3 primarily;Thewestern area ground water may divide into the stability mode, the undulation and theworsening three kind of types.Through Netpath2.0 to the same time from the research area (phreatic water toconfined water, confined water to confined water) the simulation below, may draw theconclusion: The chlorite is at throughout separates out the condition, analyzes theoutput to be more and more few, the albite transfers by the dissolved conditionseparates out the condition, the rock salt analyzes the output to reduce gradually, theniter by separates out transfers the dissolved condition, among also follows has thekaolinit' dissolution, the analogue result also mainly has Ca2+, the Na+ cationexchange adsorption.
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