Olhos de Água do Alviela
1,370 m surveyed during the CNPS-FFESSM expedition; total cave length not stated. Reached during the CNPS-FFESSM expedition, more than 700 m from the entrance.
The main karst spring of the river Alviela at the foot of the Monsanto syncline in central Portugal, once tapped for Lisbon's water supply. A French-Portuguese expedition surveyed 1,370 m and reached 125 m depth.
The Olhos de Água do Alviela rise at the foot of the Monsanto syncline and drain most of the Planalto de Santo António karst plateau, with part of the water thought to come from the Mira-Minde polje to the north-east. In the early twentieth century the spring was captured and linked by aqueduct to Lisbon, though it was later replaced by other sources.
The flooded cave descends as a sizeable gallery, 4 to 8 m across in places, with side branches. Patrick Jolivet reached about 580 m and 98 m depth in 1988. A national cave-diving commission (CNPS) expedition of the FFESSM, organised with Portuguese cavers who handled accommodation, re-lining and authorisations, re-equipped the line, surveyed 1,370 m including about 200 m of new passage, and stopped at 125 m depth more than 700 m from the entrance.
The account notes a water temperature of about 17 °C and a depigmented crayfish seen 140 m into a side passage.
수질, 유속 및 침수
The spring drains the Planalto de Santo António; tracing work cited by the expedition indicates that part of the water comes from the Mira-Minde polje.
왜 중요한가
A major Portuguese karst spring, historically part of Lisbon's water supply, and the deepest documented cave dive in the sources found for Portugal.
컨디션
Visibility on some dives in side passages dropped to 0.5-1.5 m on the return.
현재 상태가 아닌 공개된 자료의 일반적인 범위입니다.
서베이 및 탐사 역사
| 1988 | Patrick Jolivet reaches about 580 m from the entrance at -98 m. [1] |
| 2002 | A CNPS-FFESSM expedition with Portuguese cavers re-lines and surveys 1,370 m and reaches -125 m. [1] |
입구 및 다이브 사이트
One entrance, the spring pool; the expedition rigged a tyrolean to move equipment to the pool edge and a rope deviation for the last pitch.
이 시스템에 등록된 개별 입구가 아직 없습니다.
이 페이지의 모든 정보와 출처 (7)
| 정보 항목 | 상태 | 출처 |
|---|---|---|
| The expedition's deepest dive stopped at -125 m more than 700 m from the entrance. | 확인됨 | [1] |
| The expedition produced 1,370 m of survey and about 200 m of new passage with a maximum depth of -125 m. | 확인됨 | [1] |
| Patrick Jolivet's 1988 terminus was at about 580 m and -98 m. | 확인됨 | [1] |
| The expedition is filed on the FFS site as the 2002 FFESSM account; the text says the CNPS adopted the project in September 2002.Exact expedition dates are not stated in the account. | 보고됨 | [1] |
| The account mentions water at about 17 °C. | 확인됨 | [1] |
| The spring drains most of the Planalto de Santo António, with part of the water coming from the Mira-Minde polje; it was captured for Lisbon's water supply by an aqueduct built early in the twentieth century. | 확인됨 | [1] |
| Portuguese partners handled accommodation, re-equipping the cave and the authorisations for the expedition. | 최신 정보가 아닐 수 있습니다 | [1] |
확인됨: 직접 열람한 공식 또는 1차 출처에서 명시된 정보입니다. 보고됨: 2차 출처에서만 확인된 정보입니다. 출처 간 상충: 비고에 두 가지 내용이 모두 기재되어 있습니다. 최신 정보가 아닐 수 있음: 확인된 가장 최근 출처가 오래된 경우입니다.
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