A study of non-point source model on tea plantations

• Main Authors: Chi-Feng Chen, 陳起鳳
• Other Authors: Ching-Gung Wen
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/5bns92

碩士 === 國立成功大學 === 環境工程學系碩博士班 === 90 === Abstract In the last two decades, many packed non-point source (NPS) models have been developed in the world. The models need to input more parameters in the process of NPS simulation. Unfortunately, there is little NPS data measured in Taiwan region that will result in more uncertain problems while applying these models. For overcoming these disadvantages, this study aims to establish a NPS model with cooperating Distributed Rainfall-Runoff model and use a case study of tea plantation. In our model, basic NPS related formulas and little parameters are used to simulate water qualities of runoff, such as SS, NO3-N, PO4-P, TN and TP. Two tea plantations located at Xi-Ding and Shi- Zhuo along with A-Li Mountain road have been tested from Oct. 2000 to Jun. 2002. Precipitation, runoff and water qualities of 13 events at Xi-Ding and 7 events at Shi-Zhuo have been investigated. Results indicated that concentrations of Shi-Zhuo field were higher than that of Xi-Ding field, especially 1.6 times for TN and 6.3 times for TP. Much literature presented that the antecedent soil condition plays an important role in simulation of flow. In this study, a parameter ‘s ‘ was used to represent the moisture of antecedent soil and consequently verify other parameters of the Distributed Rainfall-Runoff model. Better simulation result of single peak has been given from our work. In this study, a water quality model has been developed for simulating NPS pollution in tea gardens. The result indicated that SS is better than other water quality indicators. Since it’s simulated tendencies are similar to the flow. However, that of PO4-P is worse than others. From a whole year simulation, the export coefficients of NPS pollution for tea plantation in 2000 are indicated as 63.4 kg/ha-yr for SS, 12.7 kg/ha-yr for NO3-N, 0.14 kg/ha-yr for PO4-P, 14.4 kg/ha-yr for TN and 0.26 kg/ha-yr for TP.