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基于热追踪方法的垂向潜流通量动态特征研究

发表时间:2014-07-31  浏览量:15442  下载量:7589
全部作者: 苏小茹,束龙仓,鲁程鹏,刘波,朱静思,吴光东
作者单位: 河海大学水文水资源学院,水文水资源与水利工程科学国家重点实验室
摘 要: 通过监测山东省济宁市大汶河剖面河中心垂线上位于河床不同深度处的温度时间序列,应用动态谐波回归(dynamic harmonic regression,DHR)信号处理技术得到温度波动的振幅衰减与相位延迟量,应用一维热运移方程推导出的解析解计算出垂向潜流通量值,并分析潜流通量的动态变化及其垂向分布。结果表明:地表水温度与气温以近似正弦波的形式随时间波动,而地下水温度趋于稳定,基本不随时间波动;潜流通量在监测时段内变化幅度较大,变化范围为97~321 L/(m2·d). 监测时段内各深度间潜流通量总体变化趋势为先减小后增加,潜流通量在垂向分布上存在差异,且这种差异随时间变化。
关 键 词: 水资源保护;动态潜流通量;河床温度;热运移方程;非均质性
Title: Dynamic characteristic study of vertical hyporheic flux based on a heat tracing method
Author: SU Xiaoru, SHU Longcang, LU Chengpeng, LIU Bo, ZHU Jingsi, WU Guangdong
Organization: State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, College of Hydrology and Water Resources, Hohai University
Abstract: We monitored the vertical stream temperature time series at various depths in Dawen river, Jining city, Shandong province, and calculated the instantaneous hyporheic flux through the analytical solution of one-dimensional heat transport governing equation and the dynamic harmonic regression (DHR) signal processing technology, by which the temperature fluctuation amplitude attenuation and phase delay could be obtained. Then we analyzed the dynamic characteristics and vertical distribution of hyporheic flux. The tests showed that the surface water and air temperature fluctuated approximately sinusoidally while the groundwater temperature maintained stable over time. During the monitoring period, the hyporheic flux fluctuated significantly, it ranged from 97 L/(m2穌) to 321 L/(m2穌), and the hyporheic flux between different depths firstly decreased and then increased. This vertical distribution existed differences with variation time.
Key words: water resources protection; hyporheic flux; streambed temperature; heat transport equation; heterogeneity characteristic
发表期数: 2014年7月第14期
引用格式: 苏小茹,束龙仓,鲁程鹏,等. 基于热追踪方法的垂向潜流通量动态特征研究[J]. 中国科技论文在线精品论文,2014,7(14):1421-1429.
 
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