Just breaking down the words, here's a reasonable guess. Salinity is having salts. Gradient is different amounts. A map would show you where. So I guess you are looking at where the greatest amount of salts are concentrated and where there are less or even which salts are where, if there is more than one kind available.
Remember sodium chloride (table salt) is not the only salt; there is magnesium salts such as Epsom salts and many other alkaline metal salts I can't name. I don't remember my high school chemistry that well.
what is line connecting places of equal salinity
a halocline is a strong, vertical salinity gradient
Here's a map from this website: http://aquarius.nasa.gov/education-salinity.html
the ratio between the vertical interval and horizontal equivalent is defined as the gradient.
Salinity Gradient helps providing a source of Renewable energy withi the help of Salinity gradient power. It is the difference between salt concentration of fresh water and sea water. The enery is obtained frm this osmotic pressure difference.Advantages: - No carbon dioxide emissions, almost zero fuel cost involved, environmental friendly, renewable source of energy.Disadvantges: - The waste product of using this technology is brackish water which is discharged into surrounding enviornments. the life in such water is not adapat at such aquaitc changes and can be deeply damaged and changed gradually.
The height of the land, and the scale of the map
Salinity is at its worst in the far west of New South Wales, particularly along some reaches of the Darling River. There are also increasing problems with rising salinity levels around Dubbo and Wagga Wagga. See the related link for a map.
On a weather map, the lines of equal pressure (isobars) also illustrate the pressure gradient or change of pressure per distance. The higher the pressure gradient, the higher the winds speed. Thus, when the isobars are close together, the gradient is high, and winds are higher than where the isobars are further apart. Wind can also be affected by local considerations, hills, valleys, and buildings can modify the gradient wind's direction and speed.
"Gradient" of a point quantity is a measurement of how fast it changes in a specific direction. For topography, the gradient of the land is its slope in some direction. It would work out to be dimensionless, because it has to be change in elevation/distance which is length/length no matter what units you use for the elevation or distance.
On a field map, the winds are the strongest when the isobars are very close together, and the pressure gradient is high.
Salinity is a measure of the saltiness of water.
On a field map, the winds are the strongest when the isobars are very close together, and the pressure gradient is high.