Fritz Brad G, Mendoza Donaldo P, Gilmore Tyler J
Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA 99352, USA.
Ground Water. 2009 Jan-Feb;47(1):136-40. doi: 10.1111/j.1745-6584.2008.00491.x. Epub 2008 Sep 12.
Seepage chambers have been used to characterize the flux of water across the water-sediment interface in a variety of settings. In this work, an electronic seepage chamber was developed specifically for long-term use in a large river where hydraulic gradient reversals occur frequently with river-stage variations. A bidirectional electronic flowmeter coupled with a seepage chamber was used to measure temporal changes in the magnitude and direction of water flux across the water-sediment interface over an 8-week period. The specific discharge measured from the seepage chamber compared favorably with measurements of vertical hydraulic gradient and previous specific discharge calculations. This, as well as other supporting data, demonstrates the effectiveness of the electronic seepage chamber to accurately quantify water flux in two directions over a multimonth period in this setting. The ability to conduct multimonth measurements of water flux at a subhourly frequency in a river system is a critical capability for a seepage chamber in a system where hydraulic gradients change on a daily and seasonal basis.
渗流室已被用于描述在各种环境下水通过水 - 沉积物界面的通量。在这项工作中，开发了一种电子渗流室，专门用于在一条大河中长期使用，在这条河中，水力梯度会随着河流水位变化频繁发生逆转。一个与渗流室相连的双向电子流量计被用于测量在8周时间内水通过水 - 沉积物界面的通量大小和方向的时间变化。从渗流室测得的比流量与垂直水力梯度的测量值以及先前的比流量计算结果相比表现良好。这以及其他支持数据证明了电子渗流室在这种环境下能够在数月时间内准确量化两个方向的水通量。在一个水力梯度每天和季节性变化的系统中，渗流室能够以亚小时频率进行数月的水通量测量，这是一项关键能力。
