||Pongsak (Lek) Noophan, Phanwilai Supaporn, Kevin D. Daniels, Tamao Kasahara, Shane A. Snyder, Comparison of Characteristics of Treated Effluents from Full-Scale Wetland Systems in Thailand, Japan, and USA, 12th IWA International Conference on Water Reclamation and Reuse, 107-113, 2019.06.
||Chiwa M., Haga H., Kasahara T., Tateishi M., Saito T., Kato H., Otsuki K., Onda Y. , Effect of forest thinning on hydrologic nitrate exports from a N-saturated plantation, Journal of Forestry Research, 10.1007/s11676-018-0784-5, 2018.09.
||Le Anh T. T., Kasahara Tamao, Vudhivanich Varawoot, Seasonal Variation and Retention of Ammonium in Small Agricultural Streams in Central Thailand, Environments, 5, 7, 78, 2018.07.
Yuichi Onda, Effects of Thinning on Flow Peaks in a Forested Headwater Catchment in Western Japan, 10.3390/w9060446, 9, 6, 446, 2017.06.
||Pongsak Lek Noophan, Supaporn Phanwilai, TAMAO KASAHARA, Junko Munakata-Marr, Linda Figueroa, Comparison of Nitrogen Removal and Full-Scale Wastewater Treatment Plant Characteristics in Thailand and Japan, 10, 1, 92-98, 2017.01.
||Haotian Sun, TAMAO KASAHARA, Kyoichi Otsuki, Takami Saito, Yuichi Onda, Spatio-temporal streamflow generation in a small steep headwater catchment in western Japan, Hydrological Sciences Journal, 2016.12.
||笠原 玉青, Gomi T, Nakaegawa, Murakami S, Preface to the Japanese Special Issue Volume 14; 3rd International Conference on Forests and Water in a Changing Environment, Hydrological Processes, 10.1002/hyp.10741, 29, 24, 4977-4978, 2015.11.
||Makiko Tateishi, Xiang Y, Saito T, Otsuki K, 笠原 玉青, Changes in canopy transpiration of Japanese cypress and Japanese cedar plantations due to selective thinning., Hydrological Processes, 10.1002/hyp.10700, 29, 24, 5088-5097, 2015.11.
||Noah M. Schmadel1, Bethany T. Neilson, TAMAO KASAHARA, Deducing the spatial variability of exchange within a longitudinal channel water balance, 10.1002/hyp.9854, 28, 7, 3088-3103, 2014.03, Developing an appropriate data collection scheme to infer stream–subsurface interactions is not trivial due to the spatial and temporal variability of exchange flowpaths. Within the context of a case study, this paper presents the results from a number of common data collection techniques ranging from point to reach scales used in combination to better understand the spatial complexity of subsurface exchanges, infer the hydrologic conditions where individual influences of hyporheic and groundwater exchange components on stream water can be characterized, and determine where gaps in information arise. We start with a tracer-based, longitudinal channel water balance to quantify hydrologic gains and losses at a sub-reach scale nested within two consecutive reaches. Next, we look at groundwater and stream water surface levels, shallow streambed vertical head gradients, streambed and aquifer hydraulic conductivities, water chemistry, and vertical flux rates estimated from streambed temperatures to provide more spatially explicit information. As a result, a clearer spatial understanding of gains and losses was provided, but some limitations in interpreting results were identified even when combining information collected over various scales. Due to spatial variability of exchanges and areas of mixing, each technique frequently captured a combination of groundwater and hyporheic exchange components. Ultimately, this study provides information regarding technique selection, emphasizes that care must be taken when interpreting results, and identifies the need to apply or develop more advanced methods for understanding subsurface exchanges. .
||Kasahara, T. and Wondzell, S.M. , Geomorphic controls on hyporheic exchange flow in Mountain Streams, Water Resources Research , 39, SH3 1-14, 2003.01.
||Shibata, H., Sugawara, O., Toyoshima, H., Wondzell, S.M., Nakamura, F., Kasahara, T., Swanson, F.J., and Sasa, K., Nitrogen dynamics in the hyporheic zone of a forested stream during a small storm, Hokkaido, Japan. , Biogeochemistry, 69, 83-104, 2004.01.
||Kasahara, T. and Hill, A.R., Effects of riffle/step restoration on hyporheic zone chemistry in N-rich lowland streams. , Canadian Journal of Fisheries and Aquatic Sciences, 63, 120-133, 2006.01.