CAJ | 학술논문

应用河床温度时序资料对地表水与地下水交换过程进行评价。首先假设半无限空间上部温度边界按正弦波动，由1D 地下水渗流传热模型，得到采用温度衰减规律计算地下水流速的解析模型；典型的解析模型求解有 Hatch 解析解和 Keery 解析解，Hatch 解考虑了热弥散效应所引入的误差，因此其计算精度优于 Keery 解。然后基于典型渗透性介质，通过算例讨论了解析模型的适用性和局限性。研究结果表明：只有研究区能简化为均质多孔介质、地下水的1D 垂向运动占主导地位时，才能采用解析法确定地下水流速；采用常规的测点距离（1．0 m 左右），振幅比法能有效评价流速在（-1．0～8．0）×10-5 m/s 的地下水活动，而相位滞后法能有效评价流速在（0．0～1．6）×10-4 m/s 的地下水活动；采用温度时序资料解析模型计算地下水流速时，2个测点间必须存在振幅衰减或相位滞后，因此需要预估研究区地下水流速以便设置合理的测点间距。实例研究表明，该解析方法能够有效地评价地表水与地下水交换的时域特征。
응용하상온도시서자료대지표수여지하수교환과정진행평개。수선가설반무한공간상부온도변계안정현파동，유1D 지하수삼류전열모형，득도채용온도쇠감규률계산지하수류속적해석모형；전형적해석모형구해유 Hatch 해석해화 Keery 해석해，Hatch 해고필료열미산효응소인입적오차，인차기계산정도우우 Keery 해。연후기우전형삼투성개질，통과산례토론료해석모형적괄용성화국한성。연구결과표명：지유연구구능간화위균질다공개질、지하수적1D 수향운동점주도지위시，재능채용해석법학정지하수류속；채용상규적측점거리（1．0 m 좌우），진폭비법능유효평개류속재（-1．0～8．0）×10-5 m/s 적지하수활동，이상위체후법능유효평개류속재（0．0～1．6）×10-4 m/s 적지하수활동；채용온도시서자료해석모형계산지하수류속시，2개측점간필수존재진폭쇠감혹상위체후，인차수요예고연구구지하수류속이편설치합리적측점간거。실례연구표명，해해석방법능구유효지평개지표수여지하수교환적시역특정。
Temperature time-series records were used to determine groundwater-surface water (GW SW)exchange.If it is assumed that the temperature on the top boundary is oscillated in a sinusoidal pattern,the analytic model to calculate the seepage velocity by temperature damping can be obtained. Two typical analytic solutions are Hatch solution and Keery solution.The study shows that the Hatch solution is more accurate due to taking thermal diffusion into account.So it’s recommended that Hatch solution should be adopted to calculate seepage velocity.A typical permeable medium is taken as a case, and limitations and applicability of the model were discussed.It is shown that only when the study area can be simplified as a homogeneous medium and vertical seepage is dominant,the analytic model can be used.For the common interval of test points (around 1.0 m),it’s more effective to compute seepage velocity from -1.0×10-5 m/s to 8.0×10-5 m/s by using amplitude damping method and from 0.0 m/s to 1.6×10-4 m/s by using phase lagging method,respectively.For the analytic model,the two test points must have amplitude damping and phase lagging.So the seepage velocity in the domain should be estimated firstly,and the reasonable interval of test points be designed then.It is shown from a case study that this method is available for evaluating the temporal variation of GW SW exchange.