Influence of rain, air temperature, and snow cover on subsequent spring-snowmelt infiltration into thin frozen soil layer in northern Japan

Yukiyoshi Iwata, Manabu Nemoto, Shuichi Hasegawa, Yosuke Yanai, Kazunobu Kuwao, Tomoyoshi Hirota

研究成果: ジャーナルへの寄稿学術誌査読

66 被引用数 (Scopus)

抄録

In cold regions, thick frozen soil layers can significantly impede snowmelt infiltration and thus increase runoff of spring snowmelt water. This study aimed to clarify the relationship between soil freezing and spring-snowmelt infiltration in regions with mild climates and thin frozen soil layers. Spring-snowmelt infiltration into agricultural fields was quantified in Sapporo and Memuro in northern Japan. At each site, snow was removed in early winter to enhance soil freezing in one (treatment) plot and was undisturbed in another (control) plot. As compared to Memuro, the thicker snow cover and warmer winter air temperatures in Sapporo kept the soil unfrozen in the control plot, resulting in a substantial amount of snowmelt infiltration in that plot. However, the thick (>0.4. m) frozen layer impeded snowmelt infiltration in the Memuro treatment plot. The frost depth at the Sapporo treatment plot was almost the same as that at the Memuro control plot (∼0.15. m in the early snowmelt period). Although most of the snowmelt infiltrated into the ground in the Memuro control plot, infiltration was impeded in the Sapporo treatment plot by a thin ice-rich layer that was formed in the following processes: (1) The air temperature briefly rose above 0 °C and rain fell in January and February. (2) The air temperature then dropped to between -8 and -3 °C. (3) The snowmelt and rain water froze near the soil surface. A simple calculation revealed that the thin snow cover was required to freeze a large amount of water near the soil surface in a short period under the air temperature observed after the rain event at the Sapporo site.

本文言語英語
ページ(範囲)165-176
ページ数12
ジャーナルJournal of Hydrology
401
3-4
DOI
出版ステータス出版済み - 5月 3 2011
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 水の科学と技術

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