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題 名 | Soil Crust Impedance and Critical Penetration Distance (2)--Effects of Initial Soil Moisture Content, Compaction and Drying Rate=土壤表殼阻力與關鍵穿透距離(2)--初始土壤含水率、壓力與乾燥速率之影響 |
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作 者 | 朱元南; | 書刊名 | 農業工程學報 |
卷 期 | 38:4 1992.12[民81.12] |
頁 次 | 頁80-90 |
分類號 | 434.222 |
關鍵詞 | 土壤; 含水率; 表殼; 阻力; 穿透; 乾燥; 速率; 距離; 壓力; |
語 文 | 英文(English) |
中文摘要 | 本研究探討初始土壤含水率、土壤表面所施之壓力、以及乾燥速率對土壤表殼阻力及關鍵穿透距離之影響。初始土壤含水率及壓力之增加使土壤表殼阻力以線性增加。土壤受雨後5,18,及54小時所量測之表殼阻力,在初始土壤含水率由5%提高為15%時,分別增加了43,174,及233%。表面所施壓力由0增加至20 kPa時,表殼阻力在三個量測時間所增加的量分別為34,30,及48%。關鍵穿透距離隨著初始土壤含水率之增加而線性地增加。量測時間增加時,關鍵穿透距離由5小時的6.9 mm增加為54小時的10.0 mm。壓力對關鍵穿透距離的影響及乾燥速率對表殼阻力的影響皆不顯著。 |
英文摘要 | Effects of initial soil moisture content, surface compaction, and drying rate on crust impedance and the critical penetration distance were studied. Crust impedance increase linearly with an increase in initial soil moisture content and surface compaction. At three measurement times, 5, 18, and 54 hr after rainfall, crust impedance increase 43, 174, and 233%, respectively, with the increase in initial soil moisture content from 5 to 15 percent. An increase in surface compaction from 0 to 20kPa increase crust impedance by 34, 30 and 48% at 5, 18, and 54 hours after rainfall, respectively. The critical penetration distance increased linearly as the initial soil moisture content increased. The critical penetration distance increased with time of measurement from 6.9 mm at 5 hr to 10.0 mm at 54 hr after rainfall. The effect of compaction on the critical penetration distance and the effect of drying rate on crust impedance were not significant. |
本系統中英文摘要資訊取自各篇刊載內容。