A simulation test model device for studying subsurface flow exchange driven by flood pulse and its application method

Abstract

The invention discloses a simulation test model device for studying hyporheic exchange under drive of flood pulse and a using method thereof. The simulation test model device comprise a trough body, an upstream ground surface water supplementing system, an underground water control box and a flood pulse driving device. A partition plate capable of dividing the trough body into a water level control chamber and a water discharging chamber, and a river nearby beach model is arranged in the water level control chamber. The underground water control box can perform hyporheic exchange with the river nearby beach model. The flood pulse driving device comprises a lifting piston capable of lifting in a partition plate and a periodic waveform driving device. The lifting piston can periodically lift under the drive of the periodic waveform driving device and enables a flood peak process line in the water level control chamber to change periodically. After the simulation test model device and the using method are adopted, the upstream ground surface water level periodically and proportionally changes along the flood peak process line under the drive of the periodic flood pulse, and the downstream underground water level is kept constant and is approximate to the hyporheic exchange situation of a natural flooding beach land.

Description

technical field [0001] The invention relates to a test device and its use method, in particular to a simulation test model device and its use method for studying the exchange of subsurface flow driven by flood pulses. Background technique [0002] Subsurface exchange is a dynamic process in which surface water and groundwater exchange and mix in rivers and their coastal zones, and plays a very important role in regulating river ecology and landscape heterogeneity. [0003] Generally speaking, the seasonal flood process will change the hydrological pattern of the river area, and then affect the subsurface exchange process between the main channel of the river and its floodplain system. This problem is further complicated by the complex flow structure in the subsurface exchange zone and the two different time scales involved in the movement of surface water and groundwater. [0004] At present, it is a common method used by scholars at home and abroad to study the related iss...

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned indoor flume models usually focus on the subsurface flow exchange process under the influence of bed topography, river plane form, or obstacles (such as sand waves, steps, deep pools, shoals, gravel, wood, bends, etc.), Its most intuitive characteristic of water flow is that the river bed is completely covered by water flow. The main driving force of subsurface flow exchange comes from the unbalanced pressure near the bed surface. The focus of attention is the influence of bed surface structure on vertical subsurface flow exchange. The limitation is that it cannot It is used to study the influence of the side-beach dry-wet alternation process caused by the rapid change of water level on the lateral subsurface flow exchange in the main channel-beach system of the river

Images