Discarge compilation from The Global River Discharge (RivDIS) Project

The Global River Discharge (RivDIS) data set contains monthly discharge measurements for 1018 stations located throughout the world. The period of record varies widely from station to station, with a mean of 21.5 years. These data were digitized from published UNESCO archives by Charles Voromarty, Balaze Fekete, and B.A. Tucker of the Complex Systems Research Center (CSRC) at the University of New Hampshire. River discharge is typically measured through the use of a rating curve that relates local water level height to discharge. This rating curve is used to estimate discharge from the observed water level. The rating curves are periodically rechecked and recalibrated through on-site measurement of discharge and river stage.

中央アフリカにおける国家の崩壊

中央アフリカでは、2013年3月、当時のボジゼ政権がムスリムを主体とする武装勢力セレカの攻撃によって瓦解して以降、宗教の差異を基軸とする対立が激化し、暴力に歯止めがかからない状況が続いている。こうした｢宗教対立」の根本には、政治秩序の崩壊がある。現在の混乱は、植民地化以前の奴隷狩りをも含む長期の歴史過程において中央アフリカ国家に埋め込まれた矛盾の噴出と解釈できる。フランスをはじめとする国際社会の関与は、人道危機を緩和する効果があった一方で、結果として国土の分断を促した。事態は依然として流動的だが、中央アフリカが政治秩序の確立に失敗すれば、国際安全保障上の著しい脅威となることは避けられない。

Red Sea Region, North Africa, ca. 1730 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Carte de l'Egypte, de la Nubie, de l'Abyssinie &c., par Guillaume de l'Isle, de l'Academie Royal a Paris. It was published by Chez Henri de Leth, a l'enseigne du Pecheur ca. 1730. Scale [ca. 1:9,250,000]. Covers the Red Sea region, North Africa including portions of the Middle East and Europe. Map in French.The image inside the map neatline is georeferenced to the surface of the earth and fit to the Africa Sinusoidal projected coordinate system. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as drainage, major roads, cities and other human settlements, territorial boundaries, shoreline features, and more. Relief shown pictorially. This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.