<strong>Quantification of Dissolved Organic Carbon Sources and Flow Pathways during Storm Events by Using Carbon Isotope Technique in a Forested Watershed</strong>

江端 一徳; 中村 高志; 西田 継

講演情報

[J] 口頭発表

セッション記号 A (大気水圏科学) » A-HW 水文・陸水・地下水学・水環境

[A-HW26] 同位体水文学2022

2022年5月25日(水) 10:45 〜 12:15 105 (幕張メッセ国際会議場)

コンビーナ:安原正也(立正大学地球環境科学部)、コンビーナ:大沢信二(京都大学大学院理学研究科附属地球熱学研究施設（別府）)、浅井和由(株式会社　地球科学研究所)、コンビーナ:中村高志(山梨大学大学院・国際流域環境研究センター)、座長:安原正也(立正大学地球環境科学部)、浅井和由(株式会社　地球科学研究所)、中村高志(山梨大学大学院・国際流域環境研究センター)、森川徳敏(産業技術総合研究所　活断層・火山研究部門)

11:05 〜 11:25

[AHW26-02] Quantification of Dissolved Organic Carbon Sources and Flow Pathways during Storm Events by Using Carbon Isotope Technique in a Forested Watershed

★Invited Papers

*江端一徳¹、中村高志²、西田継² (1.豊田工業高等専門学校、2.山梨大学大学院総合研究部附属国際流域環境研究センター)

キーワード：溶存有機炭素、炭素安定同位体、DOC流出寄与域、DOC流出負荷量推定モデル

Estimation of dissolved organic carbon (DOC) runoff load in a forested watershed is important for global carbon cycle and local water management. We developed DOC runoff model from two nested study areas in Yamanashi, Japan based on DOC Source Area (DSA) concept by considering hydrological connectivity and topographic feature of the catchment. However, we have not yet quantified the DSA temporal variability. Hence, monitoring the δ¹³C_DOC are useful tool as DOC pool fingerprints and to reveal the quantifying their relative contribution to stream DOC. By using EMMA, we showed each flow contribution to the DOC load and temporal variability at hourly base data and totally calculated six storm events as 63.4% to 80.3 %, 18.7 to 42.1% of surface layer contribution to DOC load at upperstream and downstream, respectively. In addition, surface layer contribution at upperstream was obviously larger than that at downstream because of the different topography and landscape between the two sites. Finally, we compare with both techniques as for isotopic EMMA and DOC runoff model, isotopic EMMA was supported DSA concept of DOC runoff model.