From: owner-ammf-digest@smoe.org (alt.music.moxy-fruvous digest) To: ammf-digest@smoe.org Subject: alt.music.moxy-fruvous digest V14 #8918 Reply-To: ammf@fruvous.com Sender: owner-ammf-digest@smoe.org Errors-To: owner-ammf-digest@smoe.org Precedence: bulk alt.music.moxy-fruvous digest Friday, May 6 2022 Volume 14 : Number 8918 Today's Subjects: ----------------- Uh-Oh what happened?? ["Keto Recipe" ] ---------------------------------------------------------------------- Date: Fri, 6 May 2022 09:41:54 -0400 From: "Keto Recipe" Subject: Uh-Oh what happened?? Uh-Oh what happened?? http://surveyed.buzz/HK8YNmXWmkFnI25rizWfdbM6uhlz6DvGkLDpQ22LwzNBevM http://surveyed.buzz/76pkWNXfoOnBSv_9BuLZZ9Y_1ivlUdC3fsGaZo0pf8BZlqyK3A Abundant barchan dunes may merge into barchanoid ridges, which then grade into linear (or slightly sinuous) transverse dunes, so called because they lie transverse, or across, the wind direction, with the wind blowing perpendicular to the ridge crest. Seif or longitudinal dunes Seif dunes are linear (or slightly sinuous) dunes with two slip faces. The two slip faces make them sharp-crested. They are called seif dunes after the Arabic word for "sword". They may be more than 160 kilometres (100 miles) long, and thus easily visible in satellite images (see illustrations). Seif dunes are associated with bidirectional winds. The long axes and ridges of these dunes extend along the resultant direction of sand movement (hence the name "longitudinal"). Some linear dunes merge to form Y-shaped compound dunes. Formation is debated. Ralph Bagnold, in The Physics of Blown Sand and Desert Dunes, suggested that some seif dunes form when a barchan dune moves into a bidirectional wind regime, and one arm or wing of the crescent elongates. Others suggest that seif dunes are formed by vortices in a unidirectional wind. In the sheltered troughs between highly developed seif dunes, barchans may be formed, because the wind is constrained to be unidirectional by the dunes ------------------------------ End of alt.music.moxy-fruvous digest V14 #8918 **********************************************