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本文选取山东省济宁市汶上境内大汶河段作为试验场地,主要对河流横断面浅层河床温度进行现场实时监测,分析河床温度剖面的空间分布和动态特征。采用热追踪方法(热量运移解析模型)求解潜流通量,定量描述潜流交换过程的空间非均质特征和动态特征。温度监测结果表明河床温度空间分布不均匀并呈显著动态变化,受到河水温度波动和河床深处某稳定热源的影响;河床浅层温度变幅大于河床深层,河床温度信号向下传递过程中具有明显的振幅衰减和相位延迟,不同测管处衰减程度存在差异。潜流通量大小随深度变化呈现了多种类型共存的特征,在监测期内,呈现出比单调增长的河水水位更加复杂的变化特征,具有显著的空间异质性。与前人研究结论相比,本次研究证实了潜流通量的时空非均质特征受到了河床地形和河水水位的影响,更加强调了区域地下水温度场与潜流交换的空间分布之间的对应关系。
In this paper, Dawenhe section in Wenshang, Jining City, Shandong Province was selected as the test site, and the on-site monitoring of shallow riverbed temperature in the river was conducted in real time. The spatial distribution and dynamic characteristics of riverbed temperature profile were analyzed. The thermal tracking method (heat transport analytical model) is used to solve the latent flux and quantitatively describe the spatial heterogeneity and dynamic characteristics of the underflow exchange process. The results of temperature monitoring show that the spatial distribution of riverbed temperature is unevenly and dynamically changed, which is affected by the fluctuation of river water temperature and a stable heat source in the depth of the riverbed. The variation of temperature in the shallow riverbed is larger than that in the riverbed, Amplitude attenuation and phase delay, there is a difference between the attenuation degree of different tubes. Submerged flux varies with depth and shows many types of coexistence characteristics. During the monitoring period, it shows a more complex variation than the monotonically increasing river water level and has significant spatial heterogeneity. Compared with previous conclusions, this study confirms that the temporal and spatial heterogeneity of sub-fluxes is affected by riverbed topography and river water level, and further emphasizes the correspondence between the regional groundwater temperature field and the spatial distribution of subsurface flow .