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Closed watercourse with a steep gradient

Type 7

Salinity: <1 g/L
Altitude: <100 m (ici : 10-116 m)
Width of the watercourse (bottom width):  <10 m
Current: Usually fast (but very sporadic)

Description

The watercourse may be intermittent. It has a steep gradient (= it descends), with mostly coarse grain size, including many boulders and rocks; lava often present). The water is fresh, generally lightly loaded. The watercourse is narrow, the canopy is continuous and the environment is totally forested. The banks are no longer clear and merge into the hillsides framing the watercourse with very steep gradients (deep watercourse).

Description

Connection of riparian areas (if intact):  Total

Altitude: <100 m (ici : 10-116 m)

Watercourse width (low): <10 m

Grain size (banks and bed): Coarse, with boulders and rocks

Gradient: Steep: 7.9% (1-20%)

Current:
Usually fast (but very sporadic)

Banks:  36° (6°-90°)

Salinity:
<1 g/L

Ten-year daily rainfall: 132 to 198 mm

Sampled stations

  • La Ravine (downstream)
  • Sens (downstream)
  • Trou à chiens (downstream and midstream)
  • Ziotte (downstream)

Main
species observed

Tree species : Tabebuia heterophylla*, Hymenaea courbaril, Calophyllum antillanum, Chrysophyllum argenteum, Homalium racemosum, Garcinia humilis, Lonchocarpus punctatus*, Citharexylum spinosum*, Artocarpus altilis, Melicoccus bijugatus*, Cocos nucifera, Mangifera indica.

Shrub species Piper dilatatum, Piper hispidum, Faramea occidentalis, Pachystachys spicata, Dalbergia ecastaphyllum.

Herbaceous species Blechnum occidentale, Tectaria heracleifolia, Blechnum lherminieri, Nephrolepis rivularis, Cenchrus purpureus.

underlined: bioengineering / restoration; in gray: species from degraded environments; *: species from somewhat xerophilic environment

Intact type

Degraded type

Intact profile

Learn more about the watercourses and riparian areas of Guadeloupe
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