Isobath
On a Geographical map, an isobathic , or isobathic curve is a line uniting of the points equal depth; it is thus a Level line , indicating the depth of a surface.
This perhaps depth of different types of surface, according to the field:
- underwater surface (Oceanography)
- surface of a layer or an underground geological structure.
- surface of a Tablecloth of subterranean water (Hydrogeology)
Sea charts
At sea, the isobath " zéro" corresponds normally to leaves low tides (or Laisse basic sea), i.e. at the minimal level reached by the sea under the only influence of the astronomical tides. On the sea charts, the isobaths are simplified (Généralisation) so as to exaggerate the zones where the depths are lower, with an aim of safety: in a point located on a given isobath, the real depth is thus always equal or higher than the value of the isobath.
The beaches of color (blue) associated with the isobaths are conventional; they are selected so as to reveal the zones low depth: on a coastal chart, the most intense blue will be able to thus correspond to the beach ranging between zero and 20 Mr.
Foot-note: like the probes, the isobaths are baptized by positive values; the isobath corresponding to the depth 20 m is thus the isobath " 20 m" , and not " - 20 m".
See too
| Random links: | Helen Gaige | IAX | Constantin Carapanos | Demak | Bruins d' Estevan | John_Herbert_Turner |