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提出以河床温度作为示踪变量,基于一维稳态垂向热量运移问题的解析解,结合曲线拟合的热追踪方法推求潜流通量和地表水温度等参数。以山东省汶上境内大汶河为例,对3个不同剖面的潜流通量进行实例分析,并通过地下水温度和潜流带深度的关系曲线揭示潜流带深度的分布规律。结果表明:热追踪方法可以定量刻画河道垂向潜流通量的非均质性。本次试验测温剖面上潜流通量变化范围为99.61～356.25L(/m2·d);在夏季,实测河床温度剖面低温区为潜流通量高值区;河道剖面上潜流通量服从正态分布,同一剖面不同位置处数值差异较大,没有明显变化趋势,存在多个集中排泄区,约62%的总潜流通量来自于50%的总剖面长度,呈显著空间非均质性,证实了通过热追踪方法研究潜流通量非均质特征的有效性;潜流带深度与潜流通量大小呈反比关系,通过此方法说明潜流带深度也呈现空间非均质性。
Based on the analytic solution of one-dimensional steady-state vertical heat transport problem, the temperature of riverbed is taken as the tracer variable, and the parameters of sub-flux and surface water temperature are deduced in combination with the thermal tracking method of curve fitting. Taking Dawen River in Wenshang, Shandong Province as an example, the underflow flux in three different sections was analyzed by example. The distribution of the depth of subsoil zone was revealed by the relationship between groundwater temperature and depth of subsoil zone. The results show that the thermal tracking method can quantitatively characterize the vertical sub-fluence heterogeneity in the river channel. In the summer, the measured low temperature region of the river bed temperature profile is the high value area of the sub-flux; the submerged flux in the cross-section of the river channel is normal Distribution, the same section at different locations at large differences in values, there is no obvious trend, there are multiple centralized discharge area, about 62% of the total sub-surface flux from the total length of 50%, showing significant spatial heterogeneity, confirmed The effectiveness of the under-flux flux heterogeneity is studied by the thermal tracking method. The depth of the subduction zone is inversely proportional to the magnitude of the sub-flux, which shows that the depth of the subsurface flow zone also exhibits spatial heterogeneity.