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首页> 外文期刊>Journal of hydrology, New Zealand >Recession of streamflow supplied from channel bed and bank storage
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Recession of streamflow supplied from channel bed and bank storage

机译：从河床和河床库提供的水流量减少

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摘要

A streamflow recession formula for natural basins is derived by nonlinear hydrologic routing of inflow from channel bed and bank storage through a stream channel storage. The formula gives basin outflow as a two-parameter, inverse square function of time and is valid when the ratio of inflow to outflow is approximately constant. It provides a good fit to a master baseflow recession curve from each of 10 basins of differing areas in the greywacke geologic terrain of Canterbury, New Zealand. These basins have no significant lakes or springs and the formula applies to that section of a master recession curve between median flow and minimum recorded 7-day low flow, for the period January to March in a flow record. The master recession curve in an ungauged asin within the same terrain may be predicted if the volume of water to be discharged during this recession can be estimated. This volume is taken to be the product of total stream length, average cross-sectional area of channel bed and bank storage and storage porosity. It can be calculated if there is a reference asin available, similar in character to the ungauged basin, with a measured master recession curve. while further testing of the formula is needed, particularly in other geologic terrains, its application is relatively simple and it should be useful at basin scale for predicting master recession curves in basins where little is known about water storage behaviour.
机译：天然盆地的径流衰退公式是通过从河床床和堤岸入库到河道入库的非线性水文路径推导得出的。该公式将流域流出量作为时间的两参数反平方函数，当流入量与流出量的比率近似恒定时有效。它与新西兰坎特伯雷格雷瓦克地质地形中不同地区的10个盆地中的每一个盆地的基本底流衰退曲线很好地吻合。这些盆地没有明显的湖泊或泉水，该公式适用于流量记录中1月至3月期间中值流量与记录的7天最低流量之间的主衰退曲线的该部分。如果可以估计在该衰退期间要排放的水量，则可以预测在同一地形中处于未开封状况的阿辛地区的主要衰退曲线。该体积被认为是总流长，通道床的平均截面积与堤岸储藏和储藏孔隙率的乘积。可以计算出是否有可用的参考值，其特征与未扩张盆地相似，且具有测得的主衰退曲线。尽管需要对该公式进行进一步测试，尤其是在其他地质地形中，但该公式的应用相对简单，在流域尺度上对储水行为知之甚少的盆地中的主衰退曲线预测中应该是有用的。

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