| Project/Area Number |
61560271
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
農業土木
|
|---|
| Research Institution | Miyazaki university |
|---|
Principal Investigator |
AKIYOSHI Yasuhiro Faculty of Agriculture Assoc.Prof., 農学部, 助教授 (30041031)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
HASHIMOTO Shusuke Faculty of Technology Assoc. Prof., 工学部, 助教授 (30037999)
|
|---|
| Project Period (FY) |
1986 – 1988
|
| Project Status |
Completed (Fiscal Year 1988)
|
| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1988: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1987: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1986: ¥1,200,000 (Direct Cost: ¥1,200,000)
|
|---|
| Keywords | Conversion of field into multipurpose / Pumping drainage / Groundwater level / シミュレーション / 耕地汎用化 / 排水 / 最適制御 / パラメーター推定 / 低平地の排水 / 塩水遡上 / 次元増大系 |
|---|
| Research Abstract |
The purpose of the present investigation is study about a few problems in the connection with the conversion of field into multipurpose one. The area of investigation is the SHINKAI,NANGO-cHo,MIYAZAKI.
The contents of the investigation are as follows.
1. the state of the flow in drainage channel. 2. The relationship of the depth in drainage channel and sea level. 3. The coeffecient of the roughness of drainage channel. 4. The change of ground-water table. 5. The state of the flow on groundwater. 6. The change of the salinity consistency of groundwater. 7. The state of the sea-water intrusion. 8. The investigation of the soil. 9. the simulation of the pump out water. 10. the runoff analysis.
The results of the experiment are summarized as follows.
1) The change of depth in drainage channel at the neap tide time is larger than the spring tide time.
2) The sea-water intrusion distance at the neap tide time is longer than the spring tide time. this sea-water intrution raise the salinity consistency of the sea-water and this phenomenon is one of the cause for the salt injury to the crops.
3) The coefficient of roughness on drainage channel is the value of 0.025-0.055. This experimental values agree well with a standard values of the coefficient of roughness on the excavation channel.
4) The salinity consistency of groundwater to the circumference of drainage channel if very raise. but, as reduse in the distatnce from drainage channel have a tendency to become low.
5) The flow of groundwater shows its own characteristics with the rainfall,irrigation and dry weather period.
6) The removal of the soil in drainage channel (the excavation works) becomes a very useful method for the drop of the groundwater and the desalinization of soil.
|
