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Evaluation of rainfall kinetic energy and erosivity in northern Taiwan using kriging with climate characteristics
Author(s) -
Liao KuoWei,
Guo JiaJun,
Fan JenChen,
Lee ChengChun,
Huang Chien Lin
Publication year - 2019
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/sum.12519
Subject(s) - universal soil loss equation , environmental science , regression analysis , kriging , regression , hydrology (agriculture) , erosion , statistics , mathematics , soil loss , geology , geomorphology , geotechnical engineering
A localized rainfall kinetic energy ( E ) equation and an erosivity map were developed, and the suitability of the universal soil loss equation ( USLE ) for assessing the soil erosion of a non‐ US region was investigated. After accurately measuring and gathering data regarding raindrop size using disdrometers in four northern Taiwan locations, this study investigated the drop size distribution under different conditions by categorizing the rainfall patterns to develop regression equations for estimating the unit volume‐specific kinetic energy (KE mm ) and the unit time‐specific kinetic energy (KE time ) of northern Taiwan. Climate zoning, which is not considered in currently used designs, was then implemented along with two‐stage cluster analysis to construct a rainfall erosivity ( R ) distribution map using the kriging model. The binary polynomial regression function of KE time , which had the highest correlation ( R 2 = 0.98), was suggested to estimate E in northern Taiwan. It was found that the pattern and intensity ( I ) of rainfall will slightly affect E . The climatic influence on the root mean square of the semivariogram was significant, which suggests that climate zoning can help estimate the rainfall erosivity ( R ). The outcomes were extended to estimate R in areas without rainfall stations.