Assessing lakebed hydraulic conductivity and seepage flux by potentiomanometer
| Autor: | John B. Ong, Vitaly A. Zlotnik |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Hydrology
geography geography.geographical_feature_category Piezometer Water injection (oil production) Test point Aquifer Soil science Penetrometer law.invention Flux (metallurgy) Hydraulic conductivity law Water Supply Water Movements Injection test Computers in Earth Sciences Geology Water Science and Technology Environmental Monitoring |
| Zdroj: | Ground water. 49(2) |
| ISSN: | 1745-6584 |
| Popis: | Potentiomanometers (PMs) are commonly used to determine flux directions across interfaces between surface waters and aquifers. We describe a complementary function: estimating small-scale hydraulic conductivity (K) in a lakebed, using the constant-head injection test (CHIT) by Cardenas and Zlotnik (2003) with the PM designed by Winter et al. (1988). A piezometer with a small screen is inserted into the lakebed. Local head potential is obtained by measuring the head difference between the test point and the aquifer interface. The piezometer is then used for water injection. This technique is illustrated by measurements taken from Alkali Lake in the Sand Hills, Nebraska, United States. Lakebed K and seepage fluxes ranged from 0.037 to 0.090 m/d and Darcy velocities ranged from 0.004 to 0.027 m/d. Results were consistent with the supplementary data gathered using a modified CHIT and a cone penetrometer. The compact size of the device and the small volumes used for injection enable this method to estimate lakebed K values as low as 0.01 to 0.1 m/d, a range seldom explored in lake-aquifer interface systems. |
| Databáze: | OpenAIRE |
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