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Splash erosion related to soil erodibility indexes and other forest soil properties in Hawaii
Author(s) -
Yamamoto Teruo,
Anderson Henry W.
Publication year - 1973
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr009i002p00336
Subject(s) - splash , environmental science , soil water , water content , bulk density , infiltration (hvac) , erosion , hydrology (agriculture) , soil science , saturation (graph theory) , soil morphology , soil type , geology , geotechnical engineering , geomorphology , materials science , mathematics , physics , combinatorics , meteorology , composite material
Soil losses under simulated rainfall were used to test indexes of erodibility based on soil aggregate size and Middleton's suspension percent. Soil samples were collected on the Koolau and Waianae ranges on Oahu, Hawaii. Soil losses expressed as gross splash erosion and maximum splash rate were related by regression on principal components to eight factors: soil erodibility index, bulk density, saturation soil moisture content, precipitation excess, organic matter content, geologic type, vegetation type, and climatic zone at the sampling site. Equations that included the percent of water stable aggregates 0.25–0.50 mm in size produced the highest explained variation: 81% in gross splash erosion and 66% in maximum splash rate. Gross splash was related to a soil erodibility index, bulk density, and infiltration and saturation moisture content; in contrast, maximum splash erosion variation was related to organic matter content as well as to an erodibility index and the bulk density of the soil. Ash and basalt colluvium soils require more careful management than basalt soils because of their higher maximum splash rates.