{"title":"Investigation of different lahar types with rainfall intensity duration curves in Arimura river basin of Sakurajima volcano","authors":"Timur Ersöz, Yutaka Gonda","doi":"10.13101/ijece.17.1","DOIUrl":"https://doi.org/10.13101/ijece.17.1","url":null,"abstract":"","PeriodicalId":492424,"journal":{"name":"International Journal of Erosion Control Engineering","volume":"6 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139887186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Investigation of different lahar types with rainfall intensity duration curves in Arimura river basin of Sakurajima volcano","authors":"Timur Ersöz, Yutaka Gonda","doi":"10.13101/ijece.17.1","DOIUrl":"https://doi.org/10.13101/ijece.17.1","url":null,"abstract":"","PeriodicalId":492424,"journal":{"name":"International Journal of Erosion Control Engineering","volume":"101 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139827404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Surface runoff is likely to occur on ashfall deposit slopes due to a decrease in the infiltration capacity of the ground surface. Although the mechanism of reduced infiltration capacity due to increasing fine particle content (Fc) in volcanic ash has been clarified, the effect of Fc on surface runoff processes on slopes with thin deposits of ashfall is not well understood. Therefore, we conducted a laboratory rainfall simulation experiment (simulated intensities of 5 mm h-1,15mmh-1, and 30 mm h-1) on slopes with 1 cm thick deposits of volcanic ash with different Fc. Experimental plots were prepared by depositing a volcanic ash layer on highly permeable silica sand. Runoff water and sediment from the experimental plots did not occur at 5 mm h-1 regardless of Fc, while at 15 mm h-1, they did and did not occur at the same Fc. On the other hand, runoff water and sediment tended to increase with increasing Fc at 30 mm h-1. Sediment yield tended to increase with an increasing amount of runoff water. The estimated maximum infiltration rate (α ) of the experimental plots was higher than the given simulated intensity and tended to decrease with increasing Fc. These results suggest that surface runoff may occur on slopes with thin deposits of ashfall, even under conditions where the rainfall intensity is below the maximum infiltration rate.
由于地表入渗能力的降低，地表径流很可能发生在灰渣沉积斜坡上。虽然火山灰中细颗粒含量增加导致入渗能力降低的机制已经明确，但Fc对薄灰渣沉积斜坡地表径流过程的影响尚不清楚。因此，我们在具有不同Fc的1 cm厚火山灰沉积物的斜坡上进行了室内降雨模拟实验(模拟强度为5mmh-1、15mmh-1和30 mmh-1)。通过在高渗透性硅砂上沉积火山灰层来制备试验田。在5 mm h-1时，实验区的径流水和沉积物不发生，而在15 mm h-1时，它们在相同的Fc下发生或不发生。另一方面，在30 mm h-1时，径流水量和泥沙随Fc的增加而增加。产沙量随径流水量的增加而增加。估算的最大入渗速率(α)高于给定的模拟强度，并随Fc的增加呈下降趋势。这些结果表明，即使在降雨强度低于最大入渗速率的情况下，地表径流也可能发生在有薄灰渣沉积的斜坡上。
{"title":"Effect of Fine Particle Content in Volcanic Ash on Slope Surface Runoff: Laboratory Rainfall Simulation Assuming a Slope with Thin Deposits of Ashfall","authors":"Marino HIRAOKA, Naoki IMAMORI, Takeshi SHIMIZU, Koji ISHIDA, Kentaro YAMASHITA, Hiroyuki KAKIHARA","doi":"10.13101/ijece.16.36","DOIUrl":"https://doi.org/10.13101/ijece.16.36","url":null,"abstract":"Surface runoff is likely to occur on ashfall deposit slopes due to a decrease in the infiltration capacity of the ground surface. Although the mechanism of reduced infiltration capacity due to increasing fine particle content (Fc) in volcanic ash has been clarified, the effect of Fc on surface runoff processes on slopes with thin deposits of ashfall is not well understood. Therefore, we conducted a laboratory rainfall simulation experiment (simulated intensities of 5 mm h-1,15mmh-1, and 30 mm h-1) on slopes with 1 cm thick deposits of volcanic ash with different Fc. Experimental plots were prepared by depositing a volcanic ash layer on highly permeable silica sand. Runoff water and sediment from the experimental plots did not occur at 5 mm h-1 regardless of Fc, while at 15 mm h-1, they did and did not occur at the same Fc. On the other hand, runoff water and sediment tended to increase with increasing Fc at 30 mm h-1. Sediment yield tended to increase with an increasing amount of runoff water. The estimated maximum infiltration rate (α ) of the experimental plots was higher than the given simulated intensity and tended to decrease with increasing Fc. These results suggest that surface runoff may occur on slopes with thin deposits of ashfall, even under conditions where the rainfall intensity is below the maximum infiltration rate.","PeriodicalId":492424,"journal":{"name":"International Journal of Erosion Control Engineering","volume":"65 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135567447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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