Application of Ponding Water Depth Sensing and System Dynamics Model for Water Management of Paddy Field

• Main Authors: HSIEH, KUANG-PENG, 謝光鵬
• Other Authors: YU, RUEY-FANG
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/2vz8yq

碩士 === 國立聯合大學 === 環境與安全衛生工程學系碩士班 === 107 === According to statistics, the rainfall per unit area in Taiwan is triple of the world average. However, due to the steep slopes, concentrated rain and short rivers, the amount of precipitation that each person can use is only 14% of the world average. It ranks 18th in the world's water shortage countries, so the control of water resources is very important. Paddy field is currently the largest type of water used in Taiwan, the most common method used in paddy field irrigation is Irrigation method, broad which is Irrigation water continues to flow into the field from the channel to reach a certain level of water. However, there is currently no Appropriate and effective field ponding water depth measuring equipment. It causes that can’t know when the amount of water has reached the demand. Usually, farmers are required to survey the paddy field When the field reaches a certain depth of water, and the depth of the water is controlled by the switch of the blocked inlet. This is a significant waste of agricultural irrigation water because of the lack of immediate and effective methods. This study will develop a ponding water depth sensor based on a conductivity meter which can be set in paddy fields to monitor the depth of the farmland. Farmers can remotely monitor the depth of the field by mobile phone with wireless transmission and effectively control the water in the field and reduce the water consumption of the paddy field with the simple automatic valve switch. The ponding water depth sensor developed in this study is based on conductivity. Therefore, the change in conductivity can be used as the management of fertilization and the warning of the discharge of factory wastewater. This study attempts to establish a water balance model for paddy fields using the system dynamic model. By collecting the monitoring data of the ponding water depth sensor and the flow monitoring of the irrigation channel, the field water balance is simulated instantly and dynamically to understand the relationship between the channel flow and the depth of the water. It can be used as a water management strategy tool for paddy fields.