John Amor Feb 28, 2019:

slope/ridge between closure depths The term "увал глубин" is not in common usage; it seems to be an esoteric way of referring to the ridge or slope between "closure depths" in the nearshore zone (see diagram in English here: http://www.coastalwiki.org/wiki/Definitions_of_coastal_terms...

In Russian this seems to be referred to as something like the "wave transformation zone" (зона трансформации волн), although this is not in common use in English either. Anyhow, it seems to refer to the zone marked as "Д" here: http://www.geokniga.org/bookfiles/geokniga-rol-morskih-ldov-...

In some places this appears to be referred to as the "closure zone", but there does not appear to be one agreed definition as to what the "closure zone" is.

Either way, the full sentence appears to be stating that the nearshore zone is characterized by a slope with an average gradient of 0.7° between closure depths (or a closure zone with an average gradient of 0.7°; etc).

Cornelius Gillen Feb 28, 2019:

0.7 degree slope is not very steep; I would say this is a sloping ridge