| 李如忠,丁贵珍,徐晶晶,杨继伟,尹星.巢湖十五里河源头段暂态储存特征分析[J].水利学报,2014,45(6): |
| 巢湖十五里河源头段暂态储存特征分析 |
| Characteristics analysis of transient storage zone in the headwater stream of Shiwuli River in Chaohu Lake basin |
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| DOI： |
| 中文关键词: 暂态存储指标 潜流带 OTIS 模型 水文参数 巢湖 |
| 英文关键词: transient storage metrics hyporheic zone OTIS model hydrological parameters Chaohu Lake |
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| 中文摘要: |
| 为揭示巢湖十五里河源头段暂态存储区基本特征，选择氯化钠（NaCl）为示踪剂，开展现场示踪实验。在此基础上，利用OTIS 应用程序包和OTIS-P 参数优化软件估算OTIS 模型扩散系数D、河道断面面积A、暂态存储区断面面积As和交换系数α，进而计算暂态存储指标值，并以SPSS 统计软件进行回归分析。结果表明，十五里河源头段D、A、As 和α 均随水文条件而变化，且α 大体处于10-5 ~ 10-3 数量级；近半数的暂态存储行进时间中值所占比例F 200med 远低于10 %，表明暂态存储区对于水力传输的影响较为不足；交换通量qs 和侧向补给强度qL 平均值分别为2.45×10-3、5.66×10-4 m3（/ s·m），表明该河段存在一定的侧向补给作用。在相关性方面，水文参数与暂态存储指标大都没有表现出相关关系。总的来说，渠道化现象降低了十五里河源头段暂态存储区的溶质滞留能力，增大了溶质负荷向河流下游传输的可能性。 |
| 英文摘要: |
| To investigate the fundamental characteristics of transient storage zone in the headwater stream of Shiwuli River in Chaohu Lake basin， sodium chloride （NaCl） was taken as a tracer material to conduct field tracer experiments. Based on the data sets of tracer experiments， the OTIS software package and OTIS-P optimizer，proposed by Runkel （U.S. Geological Survey），were used to estimate the model parameters such as the dispersion coefficient D，the main channel cross-sectional area A，the cross-sectional area of the storage zone As and the storage zone exchange coefficient α. Transient storage metrics were further calculated by using a series of empirical formula， and regression analysis was performed by SPSS statistical software as well. The results show that the parameters D， A， As and α vary with the hydrological conditions in the study reaches， and the order of magnitude of α is 10-5 ~ 10-3. Nearly half values of the fraction within the median travel time attributable to the transient storage F 200 med are far below 10 %，which suggests the insufficient effects of transient storage on hydraulic transfer. Mean values of the hyporheic exchange flux qs and the lateral inflow rate qL are 2.45×10-3 and 5.66×10-4 m3（/ s·m）， respectively， implying the existence of lateral inflow. Moreover，no significant correlations were found among most of the hydrological parameters and transient storage metrics. In general， stream channelization reduces the solute retention capacity of transient storage zone in the headwater stream of the Shiwuli River， and increases the chance of solute loads moving downstream. |
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