Surface water and underground water undercurrent exchange self-loop test device and usage method thereof
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A test device and self-circulation technology, applied in the direction of fluid dynamics test, measuring device, machine/structural component test, etc. Tracking method can not accurately solute concentration and other problems
Active Publication Date: 2017-05-10
XIAN UNIV OF TECH
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Existing flume devices are mostly used for research on surface water infiltration and groundwater infiltration, which can be specifically divided into the following two situations: surface water self-circulating flume, the disadvantage is that groundwater simulation test cannot be carried out; groundwater infiltration test, the disadvantage is that it cannot form a self- Circulation system, its solute and total water volume all change, it cannot truly simulate the transient process of surface water and groundwater subsurface flow exchange
Due to the anisotropy of sediment pore water and the heterogeneity of solute distribution in the subsurface exchange process, the solute concentration cannot be accurately determined by the particle tracer method. How to carry out the self-circulation coupling research of surface water and groundwater is an unresolved problem in the flume test. difficulty
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Embodiment 1
[0063] Turn on the peristaltic pump 19 to make the current flow along the underground water tank 16 to the upstream water tank 5, and the total amount of solute in the surface water at time t is m (t) :
[0064] m (t) =m 0 +Δm t = CV (3)
[0065] (3) m(t) is the mass of solute in surface water at time t; m 0 =C 0 V is the initial mass of solute in surface water; Δm t is the mass change of surface water solute; C is the concentration of surface water solute at time t.
[0066] Integrating formula (3) gives:
[0067]
[0068] (4) Medium Q L is the instantaneous flow rate of the peristaltic pump 19 at time t.
[0069] Derivation of formula (4) can get:
[0070]
[0071] Arranging the formula (5) to get the subsurface exchange quantity Q H :
[0072]
[0073] Substituting formula (2) into formula (6), we can get the subsurface exchange quantity Q at time t H The calculation formula is:
[0074]
[0075] In this experiment, the surface water conductivity m...
Embodiment 2
[0077] Turn on the peristaltic pump 19 to make the water flow along the upstream water tank 5 to the underground water tank 16, and the total amount of solute in the surface water at time t is m (t) :
[0078] m (t) =m 0 +Δm t = CV (3)
[0079] Integrating formula (3) gives:
[0080]
[0081] (8) Medium Q G is the instantaneous flow rate of the peristaltic pump 19 at time t.
[0082] Derivation of formula (8) can get:
[0083]
[0084] Arranging the formula (9) to get the subsurface exchange quantity Q H :
[0085]
[0086] Substituting formula (2) into formula (10), we can get the subsurface exchange quantity Q at time t H The calculation formula is:
[0087]
[0088] In this experiment, the surface water conductivity meter measured the initial surface water concentration C at t=0 0 is 0.2g / L, the total surface water volume V is 2194L, and the groundwater volume V' is 250L. Turn on the peristaltic pump 19 to make the water flow along the upstream water ...
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Abstract
A surface water and underground water undercurrent exchange self-loop test device disclosed by the invention comprises a water tank. The water tank comprises an excess-of-water layer, a deposition layer and a sand filtering layer. An upstream water tank and a downstream water tank are respectively fixed at two ends of the water tank, an energy dissipation hole plate and a tail-gate device are respectively arranged at the communication position of the upstream water tank and the excess-of-water layer and the downstream water tank and the excess-of-water layer, a self-loop pipeline is communicated between the bottoms of the upstream water tank and the downstream water tank, the lower portion of the water tank is fixedly communicated with a plurality of underground water tanks, the underground water tanks, the upstream water tank and the downstream water tank re internally provided with solute measurement devices, the bottoms of the underground water tanks are communicated to the upstream water tank through an underground water pipeline, and the underground water pipeline is provided with a peristaltic pump. The usage method comprises: adding clear water into the deposition layer until saturation; adding the solute to a surface water unit; supplying water to a target water level to the surface water unit; opening a surface water self-loop system; opening the peristaltic pump until the solute concentration pf the surface water unit and the underground water unit is constant; and calculating the undercurrent exchange capacity of the water tank.
Description
technical field [0001] The invention belongs to the technical field of water conservancy engineering test equipment, and in particular relates to a surface water and groundwater subsurface flow exchange self-circulation test device, and also relates to a method for using the surface water and groundwater subsurface flow exchange self-circulation test device. Background technique [0002] Flume tests are widely used in the research of various fluid mechanics and seepage problems such as hydraulic machinery, hydraulic simulation, and ocean engineering. The hypoflow zone is a water-saturated sediment layer in the river bed, which connects the river water body, sediment and groundwater. In the hypoflow zone, there is an exchange and transition of material and energy between the overlying water body and groundwater, and it is an important part of the river ecosystem. . Subsurface flow exchange is an important physical process that affects the ecological health of rivers. It is d...
Claims
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Application Information
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