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The Ombla is a short river in Croatia, northeast of Dubrovnik. Its course is approximately long, and it empties into the Rijeka Dubrovačka embayment of the Adriatic Sea near Komolac in Dubrovnik-Neretva County. Rijeka Dubrovačka is actually a ria, a flooded river valley formed through changes in sea surface elevation on a geologic time scale. The river rises as a karst spring fed by groundwater replenished by Trebišnjica, which is an influent stream flowing in Popovo Polje, in the immediate hinterland of the Ombla. The elevation difference between the river's source and its mouth is just over . The average discharge of the river is per second. The drainage basin of the Ombla encompasses and, besides the short surface course, includes only groundwater flow. The Ombla is used as a source of drinking water for Dubrovnik's water supply network, and construction of a hydroelectric power plant has been planned for the past two decades. , the plans entail construction of a subsurface reservoir and a 68 megawatt power plant. The plan sparked controversy amid doubts raised with respect to environmental protection and biodiversity management, technical and financial feasibility, and procedural problems related to the project. A particular concern expressed was that the underground reservoir might trigger earthquakes. ==Source and course== The course of the Ombla River is located in the Dubrovnik-Neretva County, northeast of the city of Dubrovnik in the southernmost part of the mainland of Croatia. The area surrounding the river, known as Rijeka Dubrovačka (lit. ''Dubrovnik's River''), encompasses several villages clustered near the Ombla that are home to 12,000 people.〔(【引用サイトリンク】url=http://www.tzdubrovnik.hr/eng/vodic_novost.php?id=1603&id_main=1600 )〕 The name is also applied to an estuary of the Ombla—a ria enclosed by steep slopes of high hills,〔(【引用サイトリンク】url=http://visitdubrovnik.hr/en-GB/Attractions/Content/Significant-landscapes?Y2lcNDM%3d )〕 forming a long, wide and deep embayment of the Adriatic Sea. The Ombla rises at the foot of the Golubov Kamen massif,〔 a landform that straddles the border between Croatia and Bosnia-Herzegovina. The river rises in a cave whose roof has an clearance above the surface of the water. The primary source is located at an elevation of below sea level, and the secondary sources are found at above sea level (a.s.l.). The spring is the largest karst spring in Croatia, and one of the largest ones in the Dinarides. The surface of the water in the cave is a.s.l. The watercourse flows for approximately before reaching a weir across which the Ombla discharges into the Adriatic Sea, leading to claims that the Ombla is the shortest river in the world. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ombla」の詳細全文を読む スポンサード リンク
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