An experimental class on water holding capacity of forest for junior and senior high school students
2020
Higashihara, T. | Kuraji, K. | Inoue, M. | Ohtani, T. | Araki, Y. | Ikami, Y. | Watanabe, E. | Konishi, T.
This study proposes an experimental class on the water holding capacity of forest using a handmade and low-cost sprinkling instrument detecting Hortonian overland flow proposed by Kuraji and Hoyano (2014), which can be operated by junior and senior high school students, The low-cost sprinkling instrument consists of three plastic garden stakes, an iron flower pot holder, a two liter plastic bottle with a hole in the bottom, and a shower nozzle placed on the plastic bottle, These goods can be bought at a "100-yen shop" (a dollar store). Using the proposed instrument, students examined (three times) whether Hortonian overland flow occurred at forest plantations in their high school and in their junior high school's forest, grassland and bare grounds, These experimental classes were conducted in 2017 and 2018. In the first experiment in the forest, no flow or a little flow was observed. A leaf was hit against the shower flow in the second experiment to reproduce a raindrop in the crowded forest. Consequently, a large drop of water was produced Hortonian flow in the ground. In the school grounds, a sizeable Hortonian flow was observed in the first experiment. Consequently, students could consider a relationship between water holding capacity and the rainfall in a forest plantation and a bare field.
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