A Stratified Tracing Method for Density Stratified Flow of Fresh and Salt Water in Salt Tidal Estuary

Abstract

The invention discloses a layering tracing method for river mouth salt tide salt-fresh water density stratified flows. The layering tracing method includes the steps of (1) preparing tracing solvents, wherein according to density distribution and upper and lower bounds of the density stratified flows, the multi-level tracing solvents with different densities are prepared through two kinds of selected grease with different densities according to the proportion, and coloring agents with different colors are added into the tracing solvents with the different densities and stirred evenly to obtain the tracing solvents with different colors; (2) throwing tracing particles, wherein the prepared tracing solvents are contained in different transparent plastic bottles, a tiny copper tube is connected to each plastic bottle cap, in the testing process, the front ends of the copper tubes stretch below the water surfaces, the copper tubes are evenly swung while the plastic bottles are squeezed so that the continuous tracing particles can be generated, and the layering conditions of salinity are analyzed and determined according to layering and moving conditions corresponding to the tracing particles with the different densities and the different colors. Density layering and flow characteristics of all layers can be displayed visually by using the tracing particles with the different densities and the different colors, so that the layering tracing method is high in applicability and convenient to operate.

Description

technical field [0001] The invention belongs to the field of prototype or model measurement of water conservancy engineering and marine engineering, and in particular relates to a layered tracer method for density layered flow of salty and fresh water in estuaries. Background technique [0002] Estuarine salt tide (also known as salt tide upstream, salt water intrusion) is a natural phenomenon. When the runoff flow of the upstream river is insufficient, seawater backflow occurs, and the mixture of brackish and fresh water causes the water body of the upstream river to become salty, that is, a salt tide is formed. Salt tides generally occur in winter or dry seasons, that is, between October and March every year at the confluence of rivers and seas, such as the Yangtze River estuary, Pearl River estuary, Qiantang River estuary, etc. In the Pearl River estuary, at the end of winter and the beginning of spring every year, the amount of incoming water from the upper reaches decr...

AI Technical Summary

Problems solved by technology

Since the density of these traditional tracer particles is the same and uniform, in vertically stratified water bodies, they can only be concentrated in a certain layer with the same density as the particles, and cannot be concentrated in different density water layers in stratified water bodies. evenly distributed inside

Therefore, for the density-stratified flow of salty and fresh water in estuaries, the traditional tracer method cannot reflect the stratified characteristics of the flow field well, and cannot directly observe and analyze the fluid motion law of the stratified flow

Images