簡易優養模式在鳳山水庫之應用與探討

Simplified Eutrophic Modeling in Fonsan Reservoir

10.29417/JCSWC.199211_23(2).0004

陳樹羣(Su-Chih Chen)；郭振泰(Jan-Tai Kuo)

鳳山水庫 ； 簡易水質模式 ； 優養模式 ； Fonsan Reservoir ； simplified water quality model ； eutrophication modeling

中華水土保持學報

23卷2期（1992 / 11 / 01）

41 - 56

繁體中文

鳳山水庫係一離槽水庫，位於大高雄縣林園鄉鳳山南麓，除本身集水區流量外，主要水源係抽取自東港溪。然近年來因受東港溪之汚染，鳳山水庫之氮、磷與藻類的含量均顯著增加，已達到嚴重之優養狀態。本研究乃利用簡易之水質數學模式為工具，模擬鳳山水庫之水質變化，探討分析鳳山水庫水質汚染原因。由本研究之簡易模式（假設水體為零維且完全混合），可預測鳳山水庫磷的各種變化情形，並可估計水庫所能承受的最大汚染量，提供管制入流水質的對策。由一般優養指標（水庫內總磷濃度須低於20μg/l）及模式分析，可知如欲使鳳山水庫脫離優養階段，入流的磷含量須小於23μg/l，為目前入流水（東港溪水源）中平均磷含量的1/25。

Fonsan Reservoir is an off channel reservoir that located in Kaohsiung county. The most water supply recharge from Taokan River, but the river has been polluted. Therefore, the eutrophicate state of Fonsan Reservoir is more and more serious for the increasing of the nitrogen, phosphorous and photoplankton concentration. This research uses simplified mathematical model as a tool to simulate the variations of water quality in Fonsan Reservoir, and to investigate the causes of pollution in the reservoir. The capacity of Fonsan Reservoir is very small, so we can assume that the reservoir is a mixing water body and it is reasonable to use simplified zero-dimensional water quality model. Generally speaking, the simulated results from the model compares favorably to the measured water quality variables and phytoplankton concentrations in terms of magnitude and trend. From the prediction of simulation, if the reservoir leaves eutrophicate state, the inflow of phosphorous will need less than 23 μg/l. But the concentration of phosphorous is 25 times compare with the prediction.