Hypsographic Curve

Hypsographic Curve

 

a curve on rectangular coordinates that shows the distribution of different elevations (on land) and depths (at sea) on the earth. This curve is obtained when the elevations (upward from the beginning of the coordinates) and depths (downward from the beginning of the coordinates) are laid out along the ordinate axis and the areas covered by the designated elevations and depths are laid out along the abscissa (x-axis). The hypsographic curve shows that 80 percent of the earth’s relief belongs to the ocean bottom, the low plains on land and on the continental shelf, and high level surfaces. The part of the curve that reflects the cross section of the ocean bottom is called the bathygraphic curve. The first hypsographic curves were constructed in 1883 by A. de Lapparent and refined in 1933 by E. Kossina. In 1959, V. N. Stepanov recomputed the data for the bathy-graphic curve, which introduced major changes in previous calculations.

References in periodicals archive ?
The surface dimensions analyzed were: maximum length; maximum and median width and breadth; area, perimeter, rate of coastal development and the hypsographic curve of the area, calculated with the program ArcView 3.2 (ESRI, 1999).
Lake Juusa is characterized by a concave hypsographic curve (approximately 70% of the total water mass in the lake is in the epilimnetic zone) and a very small dynamic ratio (DR = 0.04) (see Hkanson & Jansson 1983).
The lake basin was steeply sloped (average inclination 13.2%, Table 2), and the hypsographic curve became convex (Fig.
The average slope inclination decreased to 11.2% and the lake hypsographic curve was linear or slightly concave (Fig.
3D) (excluding the deeper part where, due to progressive infilling, the slopes have smaller inclinations), the average slope inclination in the lake is 8.7%, the hypsographic curve is concave, the nearshore area deepens abruptly and the deepest part of the lake is flat and gently sloping.
Lake Juusa is characterized by a concave hypsographic curve and very small dynamic ratio (DR = 0.04).
Juusa (lake with a concave hypsographic curve) the accumulation area is characterized by CP < 2.3 (confidence level 0.95) and the proportion of the sand fraction (> 0.063 mm) is generally below 29%.