A Method for Tracing the Temperature Difference and Density Flow in Stratified Reservoirs

Abstract

The invention discloses a stratified reservoir thermal density flow tracing method mainly comprising the following steps: drawing landform and grid and inputting information into computer software, selecting a basic equation needed by the flowing incoming flow, and selecting a turbulent model and parameters complying with calculation requirements; setting physical and thermodynamics properties of the incoming flow body according to the real conditions of the incoming flow body; adding a tracking agent in the computer software, and calculating a tracking agent motion convection dispersion equation and parameters thereof; setting the incoming flow tracing agent concentration A; selecting B% of the incoming flow tracking agent concentration as the contour border of the thermal interflow when the calculation is over, thus clearly displaying shape features like the interflow specific thickness and the central line specific position. The advantages are that the novel method can clearly display thermal interflow motion conditions including shape, thickness and central position, thus ensuring calculating accuracy.

Description

technical field [0001] The invention belongs to the technical field of water flow detection, in particular to a method for tracing the temperature difference and heavy flow of stratified reservoirs. Background technique [0002] In stratified reservoirs, when the density of the incoming water body is higher than the surface density of the ambient water body, a subsurface flow will form near the reservoir inlet. According to the density of incoming water body and the density of stratified reservoir environment water body, there will be two kinds of movement conditions in different forms: the bottom flow that moves along the bottom slope and the interlaminar flow that breaks away from the bottom slope and intrudes into the environmental water body at the separation point. Due to the difference between the water temperature in the underflow and the water temperature in the ambient water body, it can be easily distinguished in the numerical simulation. Generally, the point where...

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Problems solved by technology

Due to the difference between the water temperature in the underflow and the water temperature in the ambient water body, it can be easily distinguished in the numerical simulation. Generally, the point where the density gradient is zero is taken as the interface between the underflow and the ambient water body; The interlaminar flow is limited by the fact that the water temperature of the interlaminar flow is almost the same as that of the surrounding environment. From the perspective of water temperature, it is difficult to distinguish the trajectory of the hyperpycnal flow intruding into the environmental water body.

The common practice now is to add a tracer, such as potassium permanganate solution, or other tracers that can be distinguished by color, in the incoming flow, and distinguish the boundary line by the color of the tracer; this can indeed It shows interlaminar flow water body, but the density of the incoming water body added with potassium permanganate solution changes accordingly, and thus the movement law of the mixed solution cannot fully reflect the pure temperature difference and gravity flow in the stratified reservoir environment Movement Law of Interlaminar Flow Formed in Water Body

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