Sumida River the oldest and most famous firework displays in Japan, are launched from barges across the river, between Ryōgoku and Asakusa during Summer, a festival is also held at the same time. The poet Matsuo Bashō lived by the Sumida River, alongside the famous banana tree (Japanese: bashō) from which he takes his nom de plume. The Sumida River appears in a haiku by Issa from 1820: "spring peace--a mouse licking upSumida River" The Sumida runs through Tokyo for 27 kilometers, under 26 bridges spaced at about one bridge per kilometer. Amongst these, the principal ones are: Sumida River The is
Arakawa grids Arakawa grids The Arakawa grid system depicts different ways to represent and compute orthogonal physical quantities (especially velocity- and mass-related quantities) on rectangular grids used for Earth system models for meteorology and oceanography. For example, the Weather Research and Forecasting Model uses the Arakawa Staggered C-Grid in its atmospheric calculations when using the ARW core. The five Arakawa grids (A-E) were first introduced in Arakawa and Lamb 1977. For an image of the five grids, see the following picture, or Fig. 1 in Purser and Leslie 1988. The "unstaggered" Arakawa A-grid evaluates all quantities at the same point on each