{"created":"2023-05-15T15:29:22.779493+00:00","id":19061,"links":{},"metadata":{"_buckets":{"deposit":"4f89ca4a-c7bb-49ab-a9e4-1db8aab74b67"},"_deposit":{"created_by":15,"id":"19061","owners":[15],"pid":{"revision_id":0,"type":"depid","value":"19061"},"status":"published"},"_oai":{"id":"oai:sucra.repo.nii.ac.jp:00019061","sets":["94:429:431:432:966"]},"author_link":[],"item_113_alternative_title_1":{"attribute_name":"タイトル（別言語）","attribute_value_mlt":[{"subitem_alternative_title":"水文地形学的変化における河川植生の長期変動"}]},"item_113_biblio_info_9":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2019","bibliographicIssueDateType":"Issued"}}]},"item_113_date_35":{"attribute_name":"作成日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2020-07-21","subitem_date_issued_type":"Created"}]},"item_113_date_granted_20":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2019-09-20"}]},"item_113_degree_grantor_22":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"埼玉大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"12401","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_113_degree_name_21":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士(学術)"}]},"item_113_description_13":{"attribute_name":"形態","attribute_value_mlt":[{"subitem_description":"xiv, 114 p.","subitem_description_type":"Other"}]},"item_113_description_23":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"The riparian ecosystem is one of the most divers, dynamic and complex habitats on the earth which is sensitive to both natural and human-induced impacts. Being a key element of the riparian ecosystem, its vegetation is deemed an imperative component as it renders exclusive ecosystem services. The dynamics of riparian vegetation can be influenced by both natural and anthropogenic disturbances, and it gets affected all the life history phases of riparian vegetation. The influences to which the riparian vegetation confronts can be broadly categorized by way of flow regime alterations, climate changes and sediment supply changes. The riparian vegetation manifests its feedback to the referred to influences by way of disturbances-induced vegetation responses, and when the nature’s balance collapses in persistent and/ or extreme events it may potentially cause problems of both ecological and managerial interests. In this particular research study, it wishes to focus on the Japanese river systems. Japanese rivers are uniquely characterized to other rivers anywhere in the world because those are being short in lengths and steep in gradients due to the narrow and mountainous topography of the country. Originally, the rivers in Japan were maintaining vegetation sparse riparian grounds. Nevertheless, the intensive anthropogenic interferences were made to the natural river systems during recent decades remodeling the riverine ecosystems. From the standpoint of riparian vegetation, the ecosystem remodeling is believed to modify the original temperament. The long-term evolution of riparian vegetation in the model Japanese river reaches was investigated in this study. In this case, the study attempted to carry out the work relating it to the hydrogeomorphic recasting caused by the human-induced alterations to the river systems. The studied cases were opted considering their representation of the typical Japanese river characteristics and the human-induced alterations to which they were subjected. For the sake of experimental variation, the study covered both the midstream (Shizukuishi) and downstream-most river reaches (Tedori and Fuji) in investigation of the long-term riparian vegetation evolution in reference to hydrogeomorphic remodeling considering the potential influence of climate change as well.\nIn the first case, the selected study area was a reach of the Kitakami river basin, a typical Japanese river system that is one of the steepest in Japan and is downstream of the Gosho dam, which has been operational since 1981. We performed a historical aerial imagery survey of the reach that covered 60-years of both the pre- and post- dam construction phases. Land cover evolutions along with the riparian forest cover were evaluated over time in relation to their corresponding hydrological schemes. An evident long-term forest cover encroachment trend was revealed via evidence from both hydraulics and sediment dynamics with objective verifications of flow regime characterizations pertinent to pre- and post- dam operation scenarios. Factually, this was affirmed by the results of temporal correlation analysis performed referring to the dam intervention on land cover evolutions. Furthermore, the dynamic riparian vegetation model (DRIPVEM) was employed to demonstrate its applicability in numerical modelling simulations of spatial tree distributions, under the reference river flow scheme of the same case. Validation of the simulation resulted in a moderate-to-substantial agreement with the photogrammetric observation based on the calculated Kappa statistic.\nFor the second case study, the downstream most river reach of the Tedori River was subjected. The lower Tedori River, which is a representative case of this phenomenon, is located in a region that exhibits signs of global climate change. According to the quantitative analyses of sediment accounts, the river corridor has historically reached an equilibrium since the prohibition of heavy sediment extraction activities, and the water discharge is rather steady because of dams. The contemporaneous vegetation encroachment was observed in a historical imagery survey and the vegetation dynamics of the recast river reach for the past 18 years were analysed to identify forcing hydro-climatic variables. The Normalized Difference Vegetation Index (NDVI) was adopted for the surveillance of vegetation dynamics, and multiple regression analysis was employed to evaluate its relationship with predictor variables. The river water level remained the strongest determinant of NDVI, with both Pearson correlation and standardized β coefficients of -0.405, while air temperature was next, with values of 0.363 and 0.288, respectively. These findings were further supported by the spatial distribution of temporally advancing vegetation patches determined using the aerial imagery and pixel value maxima of NDVI bands. Further, the progression of vegetation patches will presumably give rise to more pro-vegetation surroundings in the riparian terrain through reciprocal linkages with hydrogeomorphic processes. These objective predictions may help inform the proactive planning of river and coastal management.\nThe downstream most reach of the Fuji River was the subject area for the third case study. The Fuji River classically exemplifies the typical Japanese river morphology and its river basin has undergone intense dam constructions and thereby the flow scheme modification has been experienced in course of time. By way of a comparative study to the lower Tedori River case, this case study followed a comparable research template as it is observing the same matter of concern, the vegetation encroachment in the riparian zone. The historical vegetation evolution was observed in a historical imagery survey and the vegetation dynamics of the recast river reach for the past 18 years were analysed to identify forcing hydro-climatic variables. The NDVI was adopted for the surveillance of vegetation dynamics, and temporal correlation analysis was employed to evaluate its relationship with predictor variables. The air temperature remained the strongest determinant of NDVI, with a Pearson correlation coefficient of 0.600, while the river water level was next, with its value of -0.275. In comparison to the lower Tedori River case, the air temperature has presided over the hydrological variables pertinent to the lower Tedori River. However, the aerial imagery and NDVI pixel value maxima evidence the vegetation patch anatomy and the zonation of hydrogeomorphic disturbances. Conclusively, in reference to the lower Tedori River, the lower Fuji River exhibits a lag in its vegetation progression and this can be objectively interpreted by the slope of the trend line and the nominal values of reach-averaged NDVI values of both the cases. This fact can be presumably attributed to the limited extent of human-induced alterations made to the natural sedimentary processes. The heavy sediment extraction activities experienced by the lower Tedori River may have contributed substantially to modify its riparian areas to more pro-vegetation zones revamping the original vegetation suppressive sediment characteristics. Nonetheless, in the case of lower Fuji River, due to the absence of such direct interference, the natural sediment processes may have been relatively preserved manifesting the lag of vegetation encroachment in course of time.","subitem_description_type":"Abstract"}]},"item_113_description_24":{"attribute_name":"目次","attribute_value_mlt":[{"subitem_description":"Table of contents iii\nList of tables vi\nList of figures vii\nAcknowledgement x\nAbstract xi\n1.0 General introduction 1\n1.1 Objectives of the study 17\n1.1.1 General objective 17\n1.1.2 Specific objectives 17\nReferences 18\n2.0 Changes in riparian forest cover under a dam-induced flow scheme and the evaluation of a dynamic riparian vegetation model: A case study of Kitakami River 27\n2.1 Introduction 27\n2.2 Methodology 29\n2.3 Results 34\n2.4 Discussion 39\nReferences 43\n3.0 The long-term legacy of riparian vegetation in a hydrogeomorphologically remodelled fluvial setting: A case study of Tedori River 48\n3.1 Introduction 48\n3.1.1 Study area 50\n3.2 Methodology 52\n3.2.1 Extraction of sediments 52\n3.2.2 Dam construction 53\n3.2.3 Historical aerial imagery survey 54\n3.2.4 Calculation of NDVI 55\n3.2.5 Hydrological data 56\n3.2.6 Climate data 56\n3.2.7 Data analysis 57\n3.3 Results 58\n3.3.1 The state of sedimentary dynamics 58\n3.3.2 Historical aerial imagery survey 60\n3.3.3 Long-term trends of variables 61\n3.3.4 Seasonal variation of variables 62\n3.3.5 Multiple regression analysis 65\n3.4 Discussion 69\n3.4.1 Remodelling of the riparian ecosystem 70\n3.4.2 Vegetation encroachment 71\n3.4.3 Evolution of riparian vegetation and future trajectory 73\nReferences 76\n4.0 The long-term evolution of riparian vegetation in a representative river reach of Japanese river systems: Lower Fuji River 82\n4.1 Introduction 82\n4.2 Methodology 87\n4.2.1 Calculation of NDVI 87\n4.2.2 Hydrological data 87\n4.2.3 Climate data 88\n4.2.4 Data analysis 88\n4.3 Results 89\n4.3.1 Historical aerial imagery survey 89\n4.3.2 Long-term trends of variables 89\n4.3.3 Seasonal variation of variables 91\n4.3.4 Temporal correlation analysis 94\n4.4 Discussion 97\nReferences 102\n5.0 Conclusions 105\n6.0 Annexes 109","subitem_description_type":"Other"}]},"item_113_description_25":{"attribute_name":"注記","attribute_value_mlt":[{"subitem_description":"指導教員 : 藤野毅","subitem_description_type":"Other"}]},"item_113_description_33":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"subitem_description":"text","subitem_description_type":"Other"}]},"item_113_description_34":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_113_dissertation_number_19":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第1149号"}]},"item_113_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.24561/00019030","subitem_identifier_reg_type":"JaLC"}]},"item_113_publisher_11":{"attribute_name":"出版者名","attribute_value_mlt":[{"subitem_publisher":"埼玉大学大学院理工学研究科"}]},"item_113_publisher_12":{"attribute_name":"出版者名（別言語）","attribute_value_mlt":[{"subitem_publisher":"Graduate School of Science and Engineering, Saitama University"}]},"item_113_record_name_8":{"attribute_name":"書誌","attribute_value_mlt":[{"subitem_record_name":"博士論文（埼玉大学大学院理工学研究科（博士後期課程））"}]},"item_113_text_31":{"attribute_name":"版","attribute_value_mlt":[{"subitem_text_value":"[出版社版]"}]},"item_113_text_36":{"attribute_name":"アイテムID","attribute_value_mlt":[{"subitem_text_value":"GD0001155"}]},"item_113_text_4":{"attribute_name":"著者 所属","attribute_value_mlt":[{"subitem_text_value":"埼玉大学大学院理工学研究科（博士後期課程）理工学専攻"}]},"item_113_text_5":{"attribute_name":"著者 所属（別言語）","attribute_value_mlt":[{"subitem_text_value":"Graduate School of Science and Engineering, Saitama University"}]},"item_113_version_type_32":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"NALLAPERUMA, THANTHRIGE BHAGYA MADUSANKHA","creatorNameLang":"en"},{"creatorName":"ナラペルマ, タンティラゲ バーギャ マドゥシャンカ","creatorNameLang":"ja-Kana"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2020-07-21"}],"displaytype":"detail","filename":"GD0001155.pdf","filesize":[{"value":"3.5 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"GD0001155.pdf","objectType":"fulltext","url":"https://sucra.repo.nii.ac.jp/record/19061/files/GD0001155.pdf"},"version_id":"2cacbf2b-f229-4960-9681-370daf800375"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"The long-term evolution of riparian vegetation in disturbed river reaches under hydrogeomophic remodeling","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"The long-term evolution of riparian vegetation in disturbed river reaches under hydrogeomophic remodeling","subitem_title_language":"en"}]},"item_type_id":"113","owner":"15","path":["966"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2020-07-21"},"publish_date":"2020-07-21","publish_status":"0","recid":"19061","relation_version_is_last":true,"title":["The long-term evolution of riparian vegetation in disturbed river reaches under hydrogeomophic remodeling"],"weko_creator_id":"15","weko_shared_id":-1},"updated":"2023-06-23T01:54:26.553993+00:00"}