Relationships between average gully depths and widths on geological sediments underlying the Idah-Ankpa Plateau of the North Central Nigeria

作     者：L.Alimonu Oparaku R.Terungwa Iwar 

作者机构：Department of Agricultural and Environmental EngineeringUniversity of AgricultureP.M.B.2373MakurdiBenue StateNigeria 

出 版 物：《International Soil and Water Conservation Research》 (国际水土保持研究（英文）)

年 卷 期：2018年第6卷第1期

页      面：43-50页

核心收录：

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

主　　题：Gully Geological sediments Vulnerability to erosion Gully depth Gully width 

摘      要：This study investigated the relationships between the average gully depth and the average width on twoof the three geological sediments underlying the Ida-Ankpa Plateau of the North Central Nigeria. Gullylength (L), average depth (D), and average width (W) were measured on 37 and 5 gully samples formedrespectively on the Ajalli Sandstones (AS) and the Upper Coal Measures (UCM) geological *** these, the average volume (V), average cross sectional area (A), and average form factor (W/D) werecomputed. These sets of variables (L, D, W, V, A, and W/D), a total of six for each gully, were analysedusing correlation analysis and the sample bivariate regression to examine the relationships between Dand W on the two geological units. Results show that D correlates poorly, positively, and significantlywith W on the highly erodible AS (R = 0.565, P 0.01), whereas the relationship is stronger, positive,and significant on the more resistant UCM (R = 0.997, P 0.01). On the AS, D is a poor predictor of Wwith the relationship: W1 = 3.670 + 0.355D1 (R2 = 0.319), whereas it is a near-perfect predictor on theUCM (W2 = 1.667 + 0.689D2, R2 = 0.994). The results of the study suggest that for gullies cut on deep,homogeneous formations, the correlation of D with W diminishes with increasing vulnerability to erosionof the sediments, whereas the effectiveness of D as a predictive tool of W increases with the resistanceof the sediments to erosion.