We investigated the morphology and sedimentary state of an extensive modern canyon system on the northwest continental slope of Palawan Island in the southern South China Sea using multibeam bathymetry data and chirp ...We investigated the morphology and sedimentary state of an extensive modern canyon system on the northwest continental slope of Palawan Island in the southern South China Sea using multibeam bathymetry data and chirp sub-bottom profiles.The canyon system in Northwest Palawan consists of a fairly large dendritic canyon,a braided canyon,and a set of short,straight,and slope-confined gullies.The erosion state covers 71%of the system.Sediment accumulates downstream of the bend's inner side in the proximal main stem of the dendritic canyon and is eroded in its outer side.In the distal main stem,sediment is deposited inside and outside the bend.In most of the system's tributaries,decreasing slope gradients result in more sediment deposition.There is thick aggradation of sediment waves in the interfluve throughout the system,which exhibit increasing levels of stratification as the slope decreases.The lack of slump scars and headward erosion at the canyon heads,as well as the presence of regular gullies and sediment wave fields,suggest that large areas of unconfined downslope turbidity currents formed the system.We propose that frequent storms in northwestern Palawan triggered these currents by resuspending sediments on the shelf.展开更多
Concepcion is one of the small island barangay in the municipality of Agutaya. It has a total landmass of 132.297 hectares. It is located within Quinluban group of islands. This place has the variety of natural resour...Concepcion is one of the small island barangay in the municipality of Agutaya. It has a total landmass of 132.297 hectares. It is located within Quinluban group of islands. This place has the variety of natural resources like seaweeds, turtles, fish and other seafood. The prominent product in this island is ＂agar-agar＂ also known as Tambalang （local name） and other marine resources. This study determined the effects of migration to the marine ecosystem of the place. Survey method and interview schedule were used during the data gathering. Results show that most migrants came to plant seaweeds or agar-agar. Poverty motivated them to migrate in the area. The abundance of marine resources also is one of the factors for migration for these people. They experienced poverty and economic crisis in their previous place which motivated them to explore and migrate to support their basic needs.展开更多
2016年8月以来菲律宾大法官卡皮奥再次举办古地图展览,意图对中国南沙群岛提出主权声索.卡皮奥认为:(1) 1600年以前西方国家所制东南亚地图中呈现的系列岛屿——“Pulo XX”即为“Spratlys”(斯普拉特利,即南沙群岛)的前身;(2) 1630年...2016年8月以来菲律宾大法官卡皮奥再次举办古地图展览,意图对中国南沙群岛提出主权声索.卡皮奥认为:(1) 1600年以前西方国家所制东南亚地图中呈现的系列岛屿——“Pulo XX”即为“Spratlys”(斯普拉特利,即南沙群岛)的前身;(2) 1630年以后地图中出现的Isle de Paragoa/Los Bajos de Paragua等巴拉望岛以西海域中诸多未命名暗礁亦是“Spratlys”的一部分;(3)这些地图表明“Spratlys”早已属于菲律宾巴拉望岛.本文通过对相关图籍资料的考证认为,以“Pulo XX”之名出现的系列岛屿乃是越南大陆、婆罗洲近岸岛屿,与南沙群岛无关;Isle de Paragoa/Los Bajos de Paragua亦属于巴拉望岛自然大陆架的一部分,而与南沙群岛无关.相反,地图展中的相关地图及相关文本资料恰恰表明南沙群岛并不为菲律宾所有.展开更多
基金jointly supported by Natural Science Foundation of China(Nos.42076083 and 41706043)。
文摘We investigated the morphology and sedimentary state of an extensive modern canyon system on the northwest continental slope of Palawan Island in the southern South China Sea using multibeam bathymetry data and chirp sub-bottom profiles.The canyon system in Northwest Palawan consists of a fairly large dendritic canyon,a braided canyon,and a set of short,straight,and slope-confined gullies.The erosion state covers 71%of the system.Sediment accumulates downstream of the bend's inner side in the proximal main stem of the dendritic canyon and is eroded in its outer side.In the distal main stem,sediment is deposited inside and outside the bend.In most of the system's tributaries,decreasing slope gradients result in more sediment deposition.There is thick aggradation of sediment waves in the interfluve throughout the system,which exhibit increasing levels of stratification as the slope decreases.The lack of slump scars and headward erosion at the canyon heads,as well as the presence of regular gullies and sediment wave fields,suggest that large areas of unconfined downslope turbidity currents formed the system.We propose that frequent storms in northwestern Palawan triggered these currents by resuspending sediments on the shelf.
文摘Concepcion is one of the small island barangay in the municipality of Agutaya. It has a total landmass of 132.297 hectares. It is located within Quinluban group of islands. This place has the variety of natural resources like seaweeds, turtles, fish and other seafood. The prominent product in this island is ＂agar-agar＂ also known as Tambalang （local name） and other marine resources. This study determined the effects of migration to the marine ecosystem of the place. Survey method and interview schedule were used during the data gathering. Results show that most migrants came to plant seaweeds or agar-agar. Poverty motivated them to migrate in the area. The abundance of marine resources also is one of the factors for migration for these people. They experienced poverty and economic crisis in their previous place which motivated them to explore and migrate to support their basic needs.
文摘2016年8月以来菲律宾大法官卡皮奥再次举办古地图展览,意图对中国南沙群岛提出主权声索.卡皮奥认为:(1) 1600年以前西方国家所制东南亚地图中呈现的系列岛屿——“Pulo XX”即为“Spratlys”(斯普拉特利,即南沙群岛)的前身;(2) 1630年以后地图中出现的Isle de Paragoa/Los Bajos de Paragua等巴拉望岛以西海域中诸多未命名暗礁亦是“Spratlys”的一部分;(3)这些地图表明“Spratlys”早已属于菲律宾巴拉望岛.本文通过对相关图籍资料的考证认为,以“Pulo XX”之名出现的系列岛屿乃是越南大陆、婆罗洲近岸岛屿,与南沙群岛无关;Isle de Paragoa/Los Bajos de Paragua亦属于巴拉望岛自然大陆架的一部分,而与南沙群岛无关.相反,地图展中的相关地图及相关文本资料恰恰表明南沙群岛并不为菲律宾所有.
