Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1007/s10201-021-00690-y

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DOI： 10.1016/j.catena.2021.105760

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DOI： 10.1111/sum.12705

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.3897/BDJ.10.e83527

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DOI： 10.1016/j.catena.2021.105427

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DOI： 10.1007/s10113-021-01820-z

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DOI： 10.3390/w13091259

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DOI： 10.1007/s12665-021-09524-7

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.limno.2020.125844

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Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)

<p> This study investigates the relationship between distribution characteristics of fluvial morphology and geomorphic characteristics of the headstream area. The gradient of the fluvial morphology at the reach scale is large in the order of fall-pool, cascade, step-pool and pool-riffle. Slope relief and drainage density were selected as mountainous characteristic quantities that affect the longitudinal profile and the distribution characteristics of the fluvial morphology. These indices are considered to be important factors because they are related to sediment production and specific height difference of the stream bed.</p>

DOI： 10.2208/jscejhe.77.2_i_1009

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.3897/BDJ.9.e67168

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Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.3825/ECE.23.161

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.3390/SU12010065

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1002/rra.3524

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DOI： 10.3390/w11040716

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.ecss.2019.01.001

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.ecolind.2018.08.057

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Language：Japanese   Publishing type：Research paper (scientific journal)

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.ejrh.2018.10.001

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)

application/pdf

DOI： 10.14945/00025035

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Other Link： https://shizuoka.repo.nii.ac.jp/records/10049

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.3390/su10020407

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.3897/BDJ.6.e26101

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 Nature friendly river improvement technology of high gradient river is not established due to occur exessive river bed scour and erosion during flood. We conducted physical, movable-bed model to design nature friendly river channel of the Oide River (located in Nagasaki city) which is high gradient river. As a result of the experiment, masonry groin system protected river bank and rive bed in high gradient river with limited river width and complex environmental structures was formed in river channels by considering the arrangement of groin system. Further, we compared the experiment result with the past findings and examined the relationship between groin structures and scour depth.

DOI： 10.2208/jscejhe.74.i_1141

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 Estuaries are distinctive environment which fluctuates continually by mixing fresh water and sea water due to the influence of the tide and waves. However, disappearance of habitats is a serious problem in estuaries since river improvement technology in consideration of the environment has not been established. In this study, we investigated the relation between the habitat structure and river course characteristic based on the classification result of river estuaries by the energy of tide, wave and river. As a result of the classification, river estuaries were classified into three groups (wave and river dominated, low wave and tide dominated). The river course characteristic influenced habitat structure was different among groups. Habitat structures of the wave and river dominated estuaries were influenced by sinuosity, low wave estuaries were affected by relative elevation difference in water channel and tide dominated estuaries were influenced by width depth ratio.

DOI： 10.2208/jscejhe.74.i_601

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)

<p> The objective of this work was to investigate the relation between river-bed gradient and river bed configuration in a granitic headwater catchment. Further, we investigated the relationship between the step structure and controlling factors such as river course characteristics or slope angle of river bank. As a result of field survey, the transition of river bed configuration (transition of waterfall, cascade, step, and riffle from the upstream to the downstream) according to the river bed gradient was observed. The relation between the step height and maximum diameter of the step construction gravel was different between the antidune type and keystone type. In case of antidune type, maximum diameter of the step construction gravel was positively related with friction velocity. Whereas, maximum diameter of the step construction gravel of keystone type increased with the increment of river-bed gradient and step width.</p>

DOI： 10.2208/jscejhe.74.5_i_1255

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 The sediment release and deposition characteristics associated with sediment replenishment by outlet gate operation of check dam in the step-pool structured small stream (Kamogawa River in Fukuoka Pref.) were investigated. The basin was mainly consisted of sandy weathered granite and the check dam had been trapped 13,700 m3 of sediment in a mutual layer with sand and cohesive cray since establishment 29 years ago. After the gate opening on March 2017, approximately 12.1% of total sediment volume was immediately released and further 6.6% flowed out in the subsequent floods. Estimated suspended sediment (SS) concentration was reached to about 1200 mg/L in downstream. The sediment from upstream filled some pools in the steep section. It suggest that sediment release can influenced in change of land form and substrate characteristics even in the step-pool section.

DOI： 10.2208/jscejhe.74.i_913

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.3390/w9050356

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)

Here, we review existing knowledge about step-pool structures in mountain rivers with reference to their morphology, process of formation, destruction, hydraulic function, restoration, and ecological function. First, we present the constructive factors of steppool structures and their appearance, focusing on channel bed profile. Second, we summarize the processes driving the formation and destruction of step-pools, concentrating on current and sedimentation. The untidune and keystone theories are discussed as the key concepts of step-pool formation in relation to the installation of artificial step-pool structures. Third, with reference to previous studies, we discuss the relationship between step-pool structures and river course characteristics. Fourth, we describe the law of resistance and velocity in a mountain river. Finally, with reference to their ecological function, we discuss the use of step-pool structures in restoration projects. Based on earlier studies of step-pool structures, we discuss future issues and propose studies to technologize and standardize step-pool structures for river improvement and restoration.

DOI： 10.3825/ece.19.165

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)

 The establishment of a conservation strategy or restoration goal for river estuaries requires knowledge of potential biota or possible habitat characteristics. We classified the Japanese river estuaries using physical indicators related to river energy, tide energy and wave energy, based on ecoregion decided by similarity of benthos. Japanese estuaries were classified into three ecoregions (Japan Sea, the Pacific Ocean and west Nankai). Finally, we classified nine types of estuary in three ecoregions by river energy, tide energy and wave energy. This classification is basic unit for conservation, because the potential biota or possible habitat is homogeneous in the same classification.

DOI： 10.2208/jscejhe.73.i_1171

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)

<p>Estuaries are distinctive environment which fluctuates continually by mixing fresh water and sea water due to the influence of the tide and waves. However, disappearance of habitats is a serious problem in estuaries since river improvement technology in consideration of the environment has not been established. In this study, we investigated the relation between shellfish fauna and physical factors of watershed scale and river course characteristics. As a result of single correlation analysis, sinuosity, river bed complexity, comparable height difference in low flow channel, depth ratio, bed slope and number of types of habitat had significant positive correlation to abundance of shellfish fauna. These results suggest that the securement or creation of high attitude area in low flow channel should be considered when conducting the river bed excavation, or diversity of shellfish fauna can be secured by increasing the depth ratio when conducting river improvement.</p>

DOI： 10.11532/river.23.0_657

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.ecoleng.2016.10.024

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Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)

CiNii Article

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Other Link： https://ndlsearch.ndl.go.jp/books/R000000004-I027471535

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1063/1.4948918

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Scopus

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Language：English   Publishing type：Research paper (scientific journal)

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)

 A runoff model was applied to investigate outflow control effect of on-site storage and soil improvement for improving infiltration capacity. We calculated overflow amount of each manhole before and after measures at the Zenpukuji river in Tokyo using four types of hyetograph (occurrence probability 1/100). The result of simulation suggested the following: 1) large overflow amount and wide area of overflow was occurred in short term concentration rainfall, 2) effect of on-site storage and soil improvement was high in long term rainfall, although depression effect was different for each points, 3) effect of countermeasures was constant for short distance upstream and downstream form the measures point and reduction effect for upstream was high at place occurring overflow due to backwater, 4) effectiveness of countermeasures could be enhanced to intensively-introduce runoff control measures for sites overflow volume was large.

DOI： 10.2208/jscejhe.72.49

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 We examined relationship among specific discharge of flood and rainfall, geomorphology, land use and geology to reveal the influence of watershed characteristics on flood discharge. As a result of a correlation analysis, hourly rainfall depth was the most major factor to determine the flood discharge. Among the geomorphological factors, form factor and topographical gradient were major factors of increasing flood discharge. However, the effects of these factors differed by flood scale. In the land use factor, there was no clear relationship between broadleaf forest and flood discharge for each flood scale. Whereas, coniferous forest was factor to increase flood discharge at low frequency event.

DOI： 10.2208/jscejhe.72.i_1255

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 Nature friendly river improvement technology of upper reach is not established. We conducted physical, movable-bed model to design nature friendly river channel of the Oide River and investigate energy dissipating effect of step-pool structure.<br> As a result, river bed fluctuation and bank erosion could be minimized without using concrete river bank protection by appropriate arranging of groin and riprap. And, the experiment revealed that the step height and pool depth of 0.55m is the most appropriate structure of step - pool with the point of energy dissipation and river bed fluctuation in the Oide river.

DOI： 10.2208/jscejer.71.ii_397

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Other Link： https://www.jstage.jst.go.jp/article/jscejer/71/6/71_II_397/_pdf

Language：Japanese   Publishing type：Research paper (scientific journal)

<p>Combined Sewer Overflow(CSO) cause severe effect to river environment. In Japan, 200 Urban areas adopt the Combined Sewer and CSO is the nationwide problem.</p><p>In this study, We investigated the relationship between intensity of rainfall and number of occurrence of CSO in the Zenpukuji River. And, we developed the outflow simulation model of CSO by using Inforworks ICM. Then, we carried out the simulation on the assumption that infiltration facilities are set in the basins.</p><p>As a result, we reveal that over 1.1mm/5min or 2.0mm/10min, 4.3mm/30min, 6.4mm/hr rainfall caused the CSO at the upper reach of the Zenpukuji River. The simulation results indicated that the infiltration facilities can reduce the CSO peak flow when the peak discharge was under 12m3/s at the observation point.</p>

DOI： 10.11532/river.21.0_455

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)

River flow regime is important role in determining the river morphology, water use and biotic composition. In Japan, however, river management based on the concept of variation of flow regime is not taken. Because the knowledge of potential hydrological regime is lacking. In this study, we proposed the flow regime indicators which can explain seasonal change of stream flow at 52 watersheds in the Kyushu region. And, we investigated the relationship between flow regime indicators and factors that affect the hydrology (physiographic factors, geological factors and vegetation factors). Result of multiple regression analysis, flow regime indicators were well explained by the factors of physiography, geological and vegetation. The results indicated that geology of volcanic ejecta tends to stabilize the flow fluctuation, and urbanization and plantation tend to increase frequency of disturbance and drought.

DOI： 10.2208/jscejhe.71.i_1213

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DOI： 10.1007/s11355-011-0171-2

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In Japan, many restoration projects and efforts to conserve the river environment were carried out across the country. In spite of these efforts, effective measures to conserve the river ecosystem or post-evaluation of the restoration project were insufficient due to a lack of environmental indicators. We established biological indicators using fish fauna in the midstream segment-based ecoregions of the northwest ecoregions based on the concept that quality of biota can be compared in the same segment-based ecoregion. Furthermore, multiple regression analysis was carried out to explain the relationship between the index value and the physical characteristic of a habitat. As a result of the multiple regression analysis, it was found that embayment increased the number of fish species. On the other hand, weir and ponding decreased it. Establishing biological indicators using the ecoregion concept enabled to compare the integrity of fish fauna between watersheds, which had been previously difficult to examine.

DOI： 10.2208/jscejhe.69.i_1249

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

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Language：Japanese   Publishing type：Research paper (scientific journal)

<p>The restoration of river ecosystems is of worldwide interest. Although various techniques have been designed, an effective method for environmental evaluation is necessary. We report a new method for the evaluation of the riverine environment on the basis of simple fish ecological data. The 16 indexes studied were (1) native species, (2) alien species, (3) red list species, (4) genuine freshwater fish species, (5) amphidromous or brackish water fish species, (6) swimming species, (7) benthonic species, (8) flowing water species, (9) still water species, (10) permanent water species, (11) temporary water (flood plain) species, (12) spawning in vegetation area species, (13) spawning in muddy bottom species, (14) spawning in sandy-gravely bottom species, (15) spawning under rocks species, and (16) spawning in mussel species. The reference data is the maximum number of potential species . First, the fish fauna data of the evaluated point was obtained. Next, a radar chart was prepared with regard to the 16 indexes. Although this assessment method can be applied in the same ecoregion, it provided a good evaluation.</p>

DOI： 10.11532/river.16.0_449

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)

The biological indicator should be developed in the ecoregion where biota is relatively identical. Furthermore, as stream biota widely varies from headwater to downstream, it is necessary to define segment based ecoregions where biota is longitudinally identical. In this study, we delineated segment based ecoregions for ten rivers belonging to the northwest Kyushu ecoregion based on the degree of similarity of the fish fauna. The northwest Kyushu ecoregion was divided into five segment based ecoregions. As a result, fish fauna was more clearly characterized by the differences in community structure between segment based ecoregions than those between watersheds. Moreover, distinguishing segment based ecoregions, enabled us to compare the integrity of fish fauna between watersheds, which had been previously difficult to examine.

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)

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Other Link： https://ndlsearch.ndl.go.jp/books/R000000004-I10381323

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A large number of studies have been made on longitudinal changes of fish fauna, however, the relationship with the engineered viewpoint is little known. The purpose of this paper is to investigate relationship between longitudinal changes of fish fauna and segment classification defined from the viewpoint of flood control.<BR>We focused on 15 rivers in Kyushu and run TWINSPAN analysis to divide the fish fauna longitudinally and compared segment classification.<BR>The result of analysis showed that segment classification is largely corresponded with longitudinal changes of fish fauna and the values of longitudinal gradient which is the boundary of longitudinal fish fauna classification are 1/2000, 1/1000 and 1/100.

DOI： 10.2208/prohe.52.1147

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