Abstract
For the sustainable restoration of wet farm land degraded by the climate change-induced rise of ground water level (GWL) and soil salinity etc., the sheet pipe system is one of the most useful technologies which reduces cultivation obstacles due to the poor drainage by controlling the rapid drainage function and enabling farmers to produce profitable crops. This system is characterized mainly as a perforated polyethylene rolled-band sheet 180 mm in width and 1 mm thick which is drawn into the subsurface layer while transforming a drainage pipe with φ = 50 mm. The major advantage of this system is that since the sheet pipe is installed without trenching, the disturbance of land is minimized and the construction period can be shortened to about 1/4 (which reduces the cost approximately by 50%). In this study, by using the sheet pipe installed miniature-type model soil box, the drainage capacity of the sheet pipe was confirmed as being the same as the pipe-shaped standard drainage pipes. Based on the observations of the saturated–unsaturated flow and the maximum lowering rate of GWL was predicted. Finally, at the farm land wherein the free board of the adjoining canal was limited, the effectiveness of the sheet-pipe system was confirmed.
Highlights
For the sustainable restoration of farm land degraded by climate change-induced rise of ground water level (GWL) and soil salinity etc., the sheet pipe system is one of the most useful technologies
Dupuit-Forchheimer
By the MT-MSB, the drainage capacity of the sheet pipe, the change of the water head, and the vertical distribution of matric suction were measured with time on natural fine sand, and it is clarified that the flow capacity of the sheet pipe is almost the same as other drainage pipes and the storage coefficient was obtained
Summary
For the sustainable restoration of farm land degraded by climate change-induced rise of ground water level (GWL) and soil salinity etc., the sheet pipe system is one of the most useful technologies. To cultivate problematic lands sustainably, a proper management system shallow water tables and coastal areas with water intrusion haswater resulted in root zone sa of 19 is required which keeps water levels a preferablearange forwater optimum plant growth. Dupuit-Forchheimer (i.e., in a system of gravity flow toward a shallow sink, all of the flow pipe, the change of the water head, and the vertical distribution of matric suction were measured with time on natural fine sand (named Toyoura sand which is widely used in geotechnical engineering in Japan), and it is clarified that the flow capacity of the sheet pipe is almost the same as other drainage pipes and the storage coefficient was obtained.
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