Hinatuan Enchanted River Underwater Cave System
A short river in Mindanao that rises from an underwater cave entrance about 30 m deep, forms a spring pool and flows roughly 1 km to the sea. Tides and a halocline strongly affect conditions in the cave.
The Enchanted River in Hinatuan, Surigao del Sur, begins at an underwater cave entrance about 30 m below the surface of a spring pool and runs about one kilometre to the sea. The pool is a major tourist attraction, drawing more than a thousand mostly swimming visitors on busy weekends according to the Filipino Cave Divers (FCD), a volunteer group that has run expeditions there since at least 2013.
FCD expedition reports describe conditions that change with the tide. On one 2013 dive at high tide the team met seawater, a slight inward current and very poor visibility down to a halocline (a sharp boundary between fresh and salt water) at 33 m, below which the water was clear; on a dive at a different tide state there was no current and very clear water. The group notes that the cave cannot be entered near its peak outflow and reported a partial ceiling collapse in 2013.
The municipality owns 27 hectares around the river and has declared it an eco-tourism area; FCD planned a source assessment with the University of San Carlos, DENR and GIZ in 2015 and published a biophysical survey in 2016.
水、水流、洪水
Spring-fed river with a strong tidal influence: FCD divers recorded inward currents and seawater at high tide and a halocline at 33 m, and they warn that the cave is impassable near peak outflow.
なぜ重要か
One of the best-known underwater caves in the Philippines and the subject of the FCD's first scientific report, a biophysical survey funded by GIZ with the University of San Carlos.
測量と探査の歴史
| 2013-08 | FCD Expedition V re-dived the cave to the end of the permanent line and documented a recent ceiling collapse. [2] |
| 2015-03 | FCD, the University of San Carlos, DENR-BMB and GIZ planned a rapid source assessment and mapping of the system. [1] |
| 2016-09 | FCD published a biophysical survey of the Enchanted River. [3] |
入口とダイブサイト
One known entrance, an underwater opening at about 30 m in the spring pool.
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このページのすべての情報とその出典 (7)
| 情報 | ステータス | 出典 |
|---|---|---|
| The river starts from an underwater cave entrance at 30 m depth, forms a spring pool and flows about 1,000 m to the sea.Volunteer survey group's assessment plan. | 報告済み | [1] |
| On a high-tide dive in August 2013 divers met seawater, a slight inward current and very poor visibility until a halocline at 33 m; a dive at another tide state had no current and very clear water.Single expedition's observations. | 報告済み | [2] |
| The cave is impenetrable at or near peak outflow. | 報告済み | [2] |
| The Hinatuan local government acquired 27 hectares around the river and adopted an ordinance declaring it an eco-tourism area; weekend crowds exceed 1,000 people, mostly swimmers.As of March 2015; no current dive access rules were found. | 報告済み | [1] |
| The biophysical survey was funded by GIZ under its PAME project with the University of San Carlos Department of Biology. | 報告済み | [3] |
| FCD gives the location as 8.458886 N, 126.354667 E.Public tourist site. | 報告済み | [1] |
| FCD gives the location as 8.458886 N, 126.354667 E.Public tourist site. | 報告済み | [1] |
確認済み：直接開いた公式または一次情報源による記載。報告ベース：二次情報源のみによるもの。情報が競合：注釈に両方のバージョンを記載。最新情報でない可能性あり：確認できた最新の情報源が古い。
上記のソースをもとに、独自の言葉でまとめています。 修正を報告する