CAJ | 학술논문

针对滨海潜水层中存在的潮致地下水波动现象，以Kong等提出的新型Boussinesq方程为理论基础，通过摄动解析法剖析波动组成及函数表达，在此基础上分析土壤非饱和区含水层对潮致地下水波动的影响机制。结果表明：地下水波传入滨海潜水层后，主频波幅呈指数型衰减，且渗透系数越小波能衰减越快；在非线性作用下，波动传播过程中将衍生出高频波，波能从低频波向高频波迁移；当土壤的非饱和持水性较强、土壤层非饱和区厚度较小、土壤孔隙率较小时，有利于潜水层内高频波的形成。
침대빈해잠수층중존재적조치지하수파동현상，이Kong등제출적신형Boussinesq방정위이론기출，통과섭동해석법부석파동조성급함수표체，재차기출상분석토양비포화구함수층대조치지하수파동적영향궤제。결과표명：지하수파전입빈해잠수층후，주빈파폭정지수형쇠감，차삼투계수월소파능쇠감월쾌；재비선성작용하，파동전파과정중장연생출고빈파，파능종저빈파향고빈파천이；당토양적비포화지수성교강、토양층비포화구후도교소、토양공극솔교소시，유리우잠수층내고빈파적형성。
Concerning the phenomenon of tidally-induced groundwater fluctuation in a coastal aquifer, based on the new Boussinesq equation derived by Kong et al., the function express and composition of the wave were analyzed using the perturbation method. Analytical research on the influence mechanism of a tidally-induced high-frequency groundwater wave affected by the unsaturated zone aquifer was conducted. The results indicate that, after the groundwater wave propagated into the coastal aquifer, the dominant frequency amplitude decreased exponentially, and the smaller the hydraulic conductivity was, the larger the decay rate of wave energy was. Besides, under the nonlinear effect, a high-frequency wave was generated during the wave propagation process, and the wave energy transformed from a low-frequency wave to a high-frequency wave. Numerical experiment results show that the increase of unsaturated water holding capacity, the decrease of thickness of the unsaturated zone, and the decrease of porosity of soil promote the formation of a high-frequency wave.