5:15 PM - 6:45 PM
[HGM03-P08] Topology forming Runoff estimation from easily obtained Hydrological Information
Keywords:finite element, practical weather data, regression analysis
1. Natural characteristics of Wazuka Town and Yamashiro flood damage
Wazuka Town, Kyoto Prefecture, is located along the Wazuka River, a tributary of the Yodo River that flows into the Kizu River from the north.There is the Wazuka Fault parallel to the Wazuka River, and the town has alternating layers of Osaka Group and granite. When it was decided to replace a bridge over a secondary tributary of the Wazuka River near the experimental site, soft weathered granite rock came up from 2 to 4 meters below.
In the Minami Yamashiro flood disaster of 1953,in Ishidera, where the valley narrowed and turned south, there was little human damage, but luckily the houses escaped damage, but the nearby secondary tributary of the Wazuka River moved more than 10 meters and was dug deeper. As a result, erosion control dams and channel works were built, making the river more than 2 meters deep.
2. Easily available information and equipment used
Study area groundwater flow has been detected by temperature surveys at a depth of 1m and sound meters , and parallelly buried holed pipes to reduce land slides, but this time 3D groundwater analysis software AC-UNSAF3D tries to measure groundwater runoff after 30mm per hour rainfall using hydrological information.
The river discharge within the site was calculated from water depth, flow velocity, and width of water at points where there is constant water flow. The observed values in the shade and sunny places nearby were set to the weighted average of 190,000 m2, a forest area of 190,000 m2, a basin area of 230,000 m2, up to the sabo dam, which is an observation point obtained from 1/2500 topographic maps.
3.multiple regression analysis
Get values with an easy -to -find observation device (1) temperature, humidity, (3) illuminance, rainfall, rainfall, and river disaster prevention information, the number of days of elapsed, and the sabo weir basin. A multipule correlation equity was created by C-Analisys, a multi-amount analysis from 17 data from November to February, using positive correlation assumed rainfall, humidity and negative correlation assumed sprinkle days. Discharge = 0.0001*Rainfall. +0.0001*Humidity-0.0004*Sprinkle days +0.0034 was possible, but it was not significant in the F test.
The temperature observed by simple equipment was higher and the relative humidity was slightly lower than the Japan Meteorological Agency observation values as illumination influence ,observed wind speed was much less for valley terrain with many ritual bamboo. Calculated remedy temperature and humidity with ilumination and wind were nearer the Japan Meteorological Agency values , so used obsered humidity to multiple correlation analysis as evaporation reflecting data.
4 Groundwater analysis by the finite element method
The free software AC-UNSAF3D developed by Okayama University's Groundwater Study Group can also include rainfall and outflow, and in the case of free, the number of elements is limited, but it can also be converted to images by Geomodeler.
AC-UNSAF3D can also add evaporation, but it is common to use penetration mutiplying the rainfall, and this time without significant correlation, used 0.7 in forest areas, 1.0 for paved roads.
The water coefficient of the soil area around the land was measured with a Hasegawa-type simple Penetratio meter, and was around 2 x 10-5m/s. Calcutated 10 hours after 30mm rainfall for an hour. The elemant was rectangle of 8 points , triangle post of 6 point and point number was definited from down to up by left circle.
Penetration coefficient was about 2×10-5m/s by Hasegawa-penetration meter and the value of sand was calculated by pouring water to sand bowl. The polar ratios were conrete 0.04, sand 0.3, clay 0.4,holed pipe 0.6, stream0.99, storage ratios were from clay 1×10-3 to sand 1×10-4. As a result, (1)10cm slide part at 2018 July rainfall down-slided parts and 1m ground-temperature detected parts was the faster velocity areas. (2) Around the bridge renewed artea, thousands of total hydro pressurre showed at buried bridge base's water hole, but holed pipe form variable hight channel planned area makes downsize max 91m general water pressure. This shows holed pipe may reduce after raifall erosion.
Wazuka Town, Kyoto Prefecture, is located along the Wazuka River, a tributary of the Yodo River that flows into the Kizu River from the north.There is the Wazuka Fault parallel to the Wazuka River, and the town has alternating layers of Osaka Group and granite. When it was decided to replace a bridge over a secondary tributary of the Wazuka River near the experimental site, soft weathered granite rock came up from 2 to 4 meters below.
In the Minami Yamashiro flood disaster of 1953,in Ishidera, where the valley narrowed and turned south, there was little human damage, but luckily the houses escaped damage, but the nearby secondary tributary of the Wazuka River moved more than 10 meters and was dug deeper. As a result, erosion control dams and channel works were built, making the river more than 2 meters deep.
2. Easily available information and equipment used
Study area groundwater flow has been detected by temperature surveys at a depth of 1m and sound meters , and parallelly buried holed pipes to reduce land slides, but this time 3D groundwater analysis software AC-UNSAF3D tries to measure groundwater runoff after 30mm per hour rainfall using hydrological information.
The river discharge within the site was calculated from water depth, flow velocity, and width of water at points where there is constant water flow. The observed values in the shade and sunny places nearby were set to the weighted average of 190,000 m2, a forest area of 190,000 m2, a basin area of 230,000 m2, up to the sabo dam, which is an observation point obtained from 1/2500 topographic maps.
3.multiple regression analysis
Get values with an easy -to -find observation device (1) temperature, humidity, (3) illuminance, rainfall, rainfall, and river disaster prevention information, the number of days of elapsed, and the sabo weir basin. A multipule correlation equity was created by C-Analisys, a multi-amount analysis from 17 data from November to February, using positive correlation assumed rainfall, humidity and negative correlation assumed sprinkle days. Discharge = 0.0001*Rainfall. +0.0001*Humidity-0.0004*Sprinkle days +0.0034 was possible, but it was not significant in the F test.
The temperature observed by simple equipment was higher and the relative humidity was slightly lower than the Japan Meteorological Agency observation values as illumination influence ,observed wind speed was much less for valley terrain with many ritual bamboo. Calculated remedy temperature and humidity with ilumination and wind were nearer the Japan Meteorological Agency values , so used obsered humidity to multiple correlation analysis as evaporation reflecting data.
4 Groundwater analysis by the finite element method
The free software AC-UNSAF3D developed by Okayama University's Groundwater Study Group can also include rainfall and outflow, and in the case of free, the number of elements is limited, but it can also be converted to images by Geomodeler.
AC-UNSAF3D can also add evaporation, but it is common to use penetration mutiplying the rainfall, and this time without significant correlation, used 0.7 in forest areas, 1.0 for paved roads.
The water coefficient of the soil area around the land was measured with a Hasegawa-type simple Penetratio meter, and was around 2 x 10-5m/s. Calcutated 10 hours after 30mm rainfall for an hour. The elemant was rectangle of 8 points , triangle post of 6 point and point number was definited from down to up by left circle.
Penetration coefficient was about 2×10-5m/s by Hasegawa-penetration meter and the value of sand was calculated by pouring water to sand bowl. The polar ratios were conrete 0.04, sand 0.3, clay 0.4,holed pipe 0.6, stream0.99, storage ratios were from clay 1×10-3 to sand 1×10-4. As a result, (1)10cm slide part at 2018 July rainfall down-slided parts and 1m ground-temperature detected parts was the faster velocity areas. (2) Around the bridge renewed artea, thousands of total hydro pressurre showed at buried bridge base's water hole, but holed pipe form variable hight channel planned area makes downsize max 91m general water pressure. This shows holed pipe may reduce after raifall erosion.