基于1DtempPro和VFLUX的河床潜流交换通量量化研究

Quantitative Study on Exchange Flux of Undercurrent in Riverbed Based on 1DtempPro and VFLUX

分析河床潜流带地表水与地下水相互作用规律对合理开发利用水资源,维持生态系统平衡意义重大。基于热示踪法探究河床潜流交换的时空特点,结合沃克河流域的试验数据,建模分析潜流交换过程中温度场的时空分布特征,对比不同深度的温度模拟值与实测值,利用1DTempPro和VFLUX计算得河床浅层交换通量,分析二者差异,并探究了交换通量对水位的响应。结果表明,温度场存在时间波动和分层现象,水热交换主要发生于潜流带浅层区域,深层温度与交换通量均较为平稳,水位变化对交换通量影响显著。潜流通量区间主要为20~180L/(m2·d),计算时段内地表水补给地下水。该研究可为河床生态建设和保护提供依据。

Analyzing the interaction between surface water and groundwater in the hyporheic zone of riverbeds is of great significance to the rational development and utilization of water resources and maintaining the balance of the ecosystem.Based on the thermal tracing method to explore the temporal and spatial characteristics of the undercurrent exchange in the riverbed,combined with the experimental data of the Walker River Basin,the temporal and spatial distribution characteristics of the temperature field during the undercurrent exchange process was modeled and analyzed.The simulated temperature values at different depths with the measured values were compared.The 1 DTempPro and VFLUX were used to calculate the exchange flux in the shallow layer of the river bed,analyze the difference between the two,and explore the exchange flux response to the water level.The results show that there are time fluctuations and stratification in the temperature field.The water and heat exchange mainly occurs in the shallow area of the undercurrent zone.The deep temperature and exchange flux are relatively stable,and the change of water level has a significant impact on the exchange flux.The latent flux range is mainly in the range of 20-180 L/(m2·d),and the surface water replenishes the groundwater during the calculation period.This research can provide a basis for the ecological construction and protection of the riverbed.