- 期刊
溪頭地區2005年3月降雪事件熱量收支之探討
Studies on Heat Budget of Snow Event in March 2005 at Sitou Area, Central Taiwan
摘要
溪頭地區於2005年3月4日巧逢首次降雪，本研究蒐集鄰近氣象站和雨量站之資料，分析林內、外之熱收支。根據降水量之觀測，溪頭地區在本次降雪事件中，承獲17.0~20.0mm之降水量，空間分布隨海拔之遞昇而遞增。由熱收支之分析結果，柳杉林林內自降雪至積雪融解，淨輻射總量為13.67MJm^(-2)27h^(-1)，由土壤次層供應1.24MJm^(-2)27h^(-1)之能量，兩者合計為14.91MJm^(-2)27h^(-1)，其中可感熱通量與潛熱通量分別為5.38MJm^(-2)27h^(-1)、9.53MJm^(-2)27h^(-1)；林外於此期間之淨輻射總量為14.25MJm^(-2)27h^(-1)，另由土壤次層供應3.08MJm^(-2)27h^(-1)之能量，兩者合計為17.34MJm^(-2)27h^(-1)，其中5.25MJm^(-2)27h^(-1)分配予可感熱通量、12.09MJm^(-2)27h^(-1)分配予潛熱通量。崩塌地復育試驗區氣象站於此期間之淨輻射總量為13.49MJm^(-2)27h^(-1)，另由土壤次層供應3.61MJm^(-2)27h^(-1)之能量，兩者合計為17.09MJm^(-2)27h^(-1)，其中6.34MJm^(-2)27h^(-1)分配予可感熱通量、10.75MJm^(-2)27h^(-1)分配予潛熱通量。
並列摘要
The purpose of this study was to analyze the energy budget of both inside and outside of the forest by means of Bulk method according to the data of meteorological and pluviometric stations collected during the first snowfall event on March 4, 2005 at Sitou area of the central Taiwan. From the precipitation records, the equivalent precipitation ranged from 17.0 mm to 20.0 mm, increased with the increasing elevation. The energy budget analysis results showed that the gross net radiation flux inside the Japanese Cedar forest during the period of snowfall to snowmelt was 13.67 MJ m^(-2) 27 h^(-1), with an additional energy of 1.24 MJ m^(-2) 27 h^(-1) from the heat flux of sub-soil layer. Among the total amount, 5.38 MJ ^(-2) 27 h^(-1)can be attributed to sensible heat flux and 9.53 MJ m^(-2) 27 h^(-1) can be attributed to latent heat flux. Meanwhile, the gross net radiation flux outside the Japanese Cedar forest was 14.25 MJ m^(-2) 27 h^(-1), with an additional energy supplied of 3.46 MJ m^(-2) 27 h^(-1) from the heat flux of sub-soil layer. Among the total amount, 5.43 MJ m^(-2) 27 h^(-1) can be attributed to sensible heat flux and 12.27 MJ m^(-2) 27 h^(-1) can be attributed to latent heat flux. At the same time, in the restoration plot of landslide disaster place, the gross net radiation flux and soil heat flux supplied by the sub-soil layer were 13.49 MJ m^(-2) 27 h^(-1) and 3.60 MJ m^(-2) 27 h^(-1), respectively. Within the total amount, 6.34 MJ m^(-2) 27 h^(-1) can be attributed to sensible heat flux and 10.75 MJ m^(-2) 27h^(-1) can be attributed to latent heat flux.