The Study of the Design Principle of the Field Drainage System

• Main Authors: Shieh, Tian - Yuan, 謝天元
• Other Authors: Chen Rong-Song
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/78257054268468028130

碩士 === 國立中興大學 === 土木工程學系 === 86 === Due to the distinctive drainage characteristics between different kinds of fields, the design of drainage system has to be different. In order to create reliant and economical designs in drainage engineering, we must consider the unique drainage characteristics of different kinds of fields. This paper uses the diffusive tank model to produce a drainage channel net''s simulation .In this research, we chose the I-LAN-MA-LIM Agricultural lands area and the SHI-LO commercial vegetable area as the representation of the testing fields. The results of simulations show that the parameters of paddy fields are B=1.05(m/ha) 、μ= 0.35 ,and the parameters of commercial vegetable areas are B=0.75(m/ha)、μ=2.0. These parameters were used in the simulation of the SHI-LO commercial vegetable area, to do the analysis of drainage system.In this research, two assumed condition case were used to simulate, the first case is assuming one thunder storm over every ten year period (design standard), and the outside downstream water level increasing gradually from the ordinary water level 0.3m to 1.5m(about 0.8 channel high), the SHI-LO narrow drainage NO. 3 area (vegetable planting area) will not be flooded. But the other area of SHI-LO narrow drainage NO 3-1 area (paddy fields) could be flooded with approximately 45-80 cm of water, and such condition will remain about 18 hours. In another case, under the same frequency of thunder storm, but the outside downstream water level begins at 1.5 m and remains stable, the vegetable planting area will not flood, but the paddy field area will. The flood depth is the same as the result in the first case, but flooding will persist for about 21 hours.As the results of the simulation shown, the design of the field''s drainage system can meet the demand of vegetable planting area''s drainage, but in the same testing area, the paddy field''s planting area will be in flood.