Rainfall and Runoff Observations in the Subtropical Forest of Okinawa Island, Japan  

作　　者：Naoki Kabeya Akira Shimizu Takanori Shimizu Hitoshi Ikuzawa Takuya Arakaki Hiroshi Furugen Yashuhiro Ohnuki Shiho Asano 

机构地区：[1]Forestry and Forest Products Research Institute, Tsukuba, Japan [2]Incorporated Okinawa Prefecture Environment Science Centre, Urazoe, Japan [3]Kyushu Research Centre, Forestry and Forest Products Research Institute, Kumamoto, Japan [4]Okinawa Prefecture Forest Resource Research Centre, Nago, Japan

出　　处：《Journal of Water Resource and Protection》2014年第6期625-634,共10页水资源与保护（英文）

摘　　要：We set up two experimental catchments to provide an improved understanding of hydrological processes in a subtropical forested area in the northern part of Okinawa Island, Japan. We calculated runoff using water level data (recorded by a pressure-type water level gauge installed in a box culvert) and a discharge rating curve (derived from in situ observations). Water balance calculations for 2010 showed that the rainfall, runoff and evapotranspiration losses (= rainfall – runoff) were 3403.6 mm, 2285.7 mm and 1117.4 mm, respectively. This result was in agreement with previous results from other forested experimental catchments in this region. Direct runoff, as a proportion of event total rainfall, can be expressed by the empirical equation (Qdirect = 0.0048, Pevent 1.7971, R2 = 0.9599). When Pevent was 100 mm or less, the ratios of Qdirect to Pevent were less than 15% in general. When Pevent exceeded 100 mm, the ratios were 20% - 30%.We set up two experimental catchments to provide an improved understanding of hydrological processes in a subtropical forested area in the northern part of Okinawa Island, Japan. We calculated runoff using water level data (recorded by a pressure-type water level gauge installed in a box culvert) and a discharge rating curve (derived from in situ observations). Water balance calculations for 2010 showed that the rainfall, runoff and evapotranspiration losses (= rainfall – runoff) were 3403.6 mm, 2285.7 mm and 1117.4 mm, respectively. This result was in agreement with previous results from other forested experimental catchments in this region. Direct runoff, as a proportion of event total rainfall, can be expressed by the empirical equation (Qdirect = 0.0048, Pevent 1.7971, R2 = 0.9599). When Pevent was 100 mm or less, the ratios of Qdirect to Pevent were less than 15% in general. When Pevent exceeded 100 mm, the ratios were 20% - 30%.

关 键 词：Direct RUNOFF Forested WATERSHED OKINAWA ISLAND RAINFALL-RUNOFF Observation Sub-Tropical Forest Water Balance 

分 类 号：R73[医药卫生—肿瘤]