水利科技与经济
水利科技與經濟
수리과기여경제
2012年
12期
4-7
,共4页
承压含水层%潮汐%数值模型%滨海含水层%海岸带
承壓含水層%潮汐%數值模型%濱海含水層%海岸帶
승압함수층%조석%수치모형%빈해함수층%해안대
confined aquifer%tide%numerical model%coastal aquifer%coastal zone
海潮波动可以引起海岸带地下水位发生波动。建立基于有限差分法的滨海地区一维承压含水层地下水运动数值模型。通过将潮汐波动概化为正弦波,模拟滨海地区地下水位随潮汐波动的变化。结果表明,受海潮影响的滨海含水层地下水位与海潮有相似的波动特征,但变幅减小,受海潮的影响程度与离海岸的距离有关,随着离海岸距离的增加地下水位的变幅及潮汐效率呈负指函数衰减,地下水位对海潮的滞后时间随距离呈线性增加。例如,当承压含水层导水系数为31.25m^2/h、储水系数为4.5×10^-4及海潮振幅为2.5m、周期为24.7h时,在距离海岸500m处,振幅为1.35268m,潮汐效率为0.54107,滞后时间为1.825h。在距海岸达4389m以远时可以认为地下水位不受海潮波动的影响。
海潮波動可以引起海岸帶地下水位髮生波動。建立基于有限差分法的濱海地區一維承壓含水層地下水運動數值模型。通過將潮汐波動概化為正絃波,模擬濱海地區地下水位隨潮汐波動的變化。結果錶明,受海潮影響的濱海含水層地下水位與海潮有相似的波動特徵,但變幅減小,受海潮的影響程度與離海岸的距離有關,隨著離海岸距離的增加地下水位的變幅及潮汐效率呈負指函數衰減,地下水位對海潮的滯後時間隨距離呈線性增加。例如,噹承壓含水層導水繫數為31.25m^2/h、儲水繫數為4.5×10^-4及海潮振幅為2.5m、週期為24.7h時,在距離海岸500m處,振幅為1.35268m,潮汐效率為0.54107,滯後時間為1.825h。在距海岸達4389m以遠時可以認為地下水位不受海潮波動的影響。
해조파동가이인기해안대지하수위발생파동。건립기우유한차분법적빈해지구일유승압함수층지하수운동수치모형。통과장조석파동개화위정현파,모의빈해지구지하수위수조석파동적변화。결과표명,수해조영향적빈해함수층지하수위여해조유상사적파동특정,단변폭감소,수해조적영향정도여리해안적거리유관,수착리해안거리적증가지하수위적변폭급조석효솔정부지함수쇠감,지하수위대해조적체후시간수거리정선성증가。례여,당승압함수층도수계수위31.25m^2/h、저수계수위4.5×10^-4급해조진폭위2.5m、주기위24.7h시,재거리해안500m처,진폭위1.35268m,조석효솔위0.54107,체후시간위1.825h。재거해안체4389m이원시가이인위지하수위불수해조파동적영향。
Tidal fluctuations can cause coastal groundwater level fluctuations. Based on the finite difference method, we establish a numerical model in the coastal area of one - dimensional confined aquifer of groundwater. Described the tidal wave as sine wave, we obtained the tidal fluctuation change of underground water level. The results show that, under the tidal influence, the coastal aquifer underground water level and tide have similar volatility but amplitude decreases, along with the increase of the distance from the coast, groundwater level fluctuation and tidal efficiency was negative exponential declined, underground water level on the lag time linearly increased. For example, when confined aquifer water conduction coefficient is 31.25 m^2/h, water storage coefficient is 4.5 × 10^-4 and the amplitude of 2. 5 m, cycle of 24. 7 h, at a distance from the coast at 500 m, amplitude is 1. 352 68 m, tidal efficiency is 0. 541 07, the lag time of 1. 825 h. From the shore of up to 4 389 m, we can think groundwater levels affected by tidal fluctuations.