Direction and depths of hyporheic exchange fluxes at the groundwater - surface water interface are drivers of biogeochemical processes influencing nutrient cycling and water quality. Model concepts on the dynamic relationship between hyporheic exchange fluxes and exchange depth are typically based on the assumption of a linear relationship between both measures. Here, we quantify seasonal and episodic variations of hyporheic exchange fluxes and hyporheic exchange depths with methods of heat tracing. Numerically (FLUX-BOT) and analytically (VFLUX; method based on temperature amplitude dampening developed by Hatch et al., 2006, https://doi.org/10.1029/2005wr004787) working program scripts were used to solve the one-dimensional conduction-advection-dispersion equation and compute hyporheic flux rates from three vertical sediment water temperature profiles recorded continuously in a small low mountain creek between 2011 and 2017. By comparing the behavior of two differing water temperature-based modeling approaches, dissimilarities in the sensitivity to sediment thermal properties were identified. Besides the differences in parameter responsivity differences in how the temperature data is incorporated, explain deviating behavior of the models regarding exchange flux and depth calculations. We show that the vertical extension of hyporheic exchange depth has a distinctive seasonal pattern over seven years, which differs according to the positioning in the riffle-pool-sequence. Surface water levels, groundwater levels and stream discharges show significant correlations with both flux direction and hyporheic zone extension. Temperature derived flux data allowed for establishing a significant relationship between hyporheic exchange fluxes and hyporheic exchange depths.

中文翻译：

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模型选择影响季节性低流交换深度和通量的量化

地下水-地表水界面下流交换通量的方向和深度是影响养分循环和水质的生物地球化学过程的驱动因素。关于低流交换通量和交换深度之间的动态关系的模型概念通常基于两种度量之间的线性关系的假设。在这里，我们用热追踪方法量化了下流交换通量和下流交换深度的季节性和间歇性变化。数值 (FLUX-BOT) 和分析 (VFLUX；Hatch 等人开发的基于温度振幅阻尼的方法，2006，https://doi.org/10。1029/2005wr004787) 工作程序脚本用于求解一维传导-平流-弥散方程，并根据 2011 年至 2017 年间在一个小型低山小溪中连续记录的三个垂直沉积物水温剖面计算下流通量率。通过比较行为在两种不同的基于水温的建模方法中，确定了对沉积物热特性敏感性的不同之处。除了在如何合并温度数据方面的参数响应性差异之外，解释关于交换通量和深度计算的模型的偏差行为。我们表明，潜流交换深度的垂直延伸在七年中具有独特的季节性模式，根据浅滩序列中的位置而有所不同。地表水位、地下水位和河流流量与通量方向和潜流带扩展均显示出显着的相关性。温度导出的通量数据允许在下流交换通量和下流交换深度之间建立显着关系。