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Importance of considering nutrient loadings from small watersheds to a lake-A case study of the Lake Shinji watershed,Shimane Prefecture,Japan

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International Journal of Agricultural and Biological Engineering 2018年第5期11卷 124-130页

作者： Hiroaki Somura hidenobu kunii Yasumichi Yone Ikuo Takeda Hirokazu Sato Graduate School of Environmental and Life Science Okayama UniversityOkayama 7008530Japan Estuary Research Center Shimane UniversityMatsue 6908504Japan Faculty of Life and Environmental Science Shimane UniversityMatsue 6908504Japan

Nutrient loadings from upstream watersheds can have significant impacts on the water quality of receiving water ***,a major river is selected as the target for water quality studies,and the impact of minor rivers tends to be *** is very important to evaluate whether the impact of small rivers on the downstream water quality is *** water sampling and discharge modeling using SWAT were used to analyze the contribution of small rivers to water quality in a receiving *** this analysis,it was determined that the inflowing total nitrogen(TN)and total phosphorus(TP)concentrations from all target rivers exceeded the lake water environmental standards set by the Ministry of the *** contribution of suspended sediment(SS)and TN loads from small rivers did not vary markedly compared with their relative discharge contributions to the lake,at approximately 20%.However,the impact on TP loads to the lake from small rivers was 9.1%higher than their relative flow contributions,accounting for 28.2% of the TP ***,there is a potential to underestimate the impact of ungauged small rivers if only the major river is selected to evaluate the downstream lake water quality.

关键词： suspended sediment(SS) total nitrogen(TN) total phosphorus(TP) watershed management SWAT model

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Estimation of Growth Area of Aquatic Macrophytes Expanding Spontaneously in Lake Shinji Using ASTER Data

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International Journal of Geosciences 2013年第6期4卷 1-5页

作者： Yuji Sakuno hidenobu kunii Graduate School of Engineering Hiroshima University Hiroshima Japan Research Center for Coastal Lagoon Environments Shimane University Shimane Japan

In this study, we estimated the growth area of aquatic macrophytes that have expanded spontaneously in Lake Shinji, located in eastern Shimane Prefecture, Japan, using Terra satellite Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data. Visible and near infrared ASTER data from April, August, and September 2012 were used. The water depth at which ASTER can detect submersed aquatic macrophytes using in situ spectral reflectance of aquatic macrophytes and a bio-optical model was also examined. As a result, when the threshold value of a normalized difference vegetation index (NDVI) was set to 0, only aquatic macrophytes up to a depth of approximately 10 cm could be detected. The growth area of aquatic macrophytes detected by NDVI from ASTER data was in relatively good agreement with the growth area as observed by aerial photography.

关键词： ASTER NDVI Aquatic Macrophytes Bio-Optical Algorithm Lake Shinji

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