The development and evolution of sea bottom sand ridges and sand ripples are discussed.

讨论了海底沙脊和沙波发育演变问题。

youdao

The cross-section of tidal sand ridges is asymmetric with a steep slope inclining to the SW.

东海陆架冰后期潮流沙脊以不对称横剖面为特征，陡坡倾向SW。

youdao

Through comprehensive application of cores, logs and seismic data, tidal sand ridges are discovered in Pinghu Formation, Xihu Depression.

综合运用地震、测井、岩芯及分析化验资料，在西湖凹陷平湖组发现潮汐砂脊沉积体系。

youdao

Dune: accumulations of wind-blown sand in ridges or mounds that lie landward of the beach and usually parallel to the shoreline.

UNESCO: L O S S A R Y

Stony ridges gave way to tumbled boulders, slopes of sifted gravel, and then sand, blown into shifting dunes.

NEWYORKER: The Martian Chroniclers

It takes seven or eight hours and strong legs to hike the whole crossing, past ice-blue crater lakes, over snow-covered ridges and through windswept mountain deserts, where totara trees cling to the soft black volcanic sand.

BBC: A return to Middle-earth