Kinetic energy estimation by rainfall intensity and its usefulness in predicting hydrosedimentological variables in a small rural catchment in southern Brazil
Kinetic energy estimation by rainfall intensity and its usefulness in predicting hydrosedimentological variables in a small rural catchment in southern Brazil
复制标题
DOI：
10.1016/j.catena.2016.07.015
复制
发表时间：
2017-01-01
期刊：
影响因子：
6.2
通讯作者：
Canale, Tiago
中科院分区：
文献类型：
--
作者：
Ramon, Rafael;Minella, Jean P. G.;Canale, Tiago
现代农业面临的挑战之一是适应气候影响，包括雨季造成侵蚀的能力。对这些现象的理解依赖于监测降雨变量，这些变量表达了侵蚀剂的规模和模式。动能（E）是一个基本的变量来表示侵蚀力，使侵蚀和产沙的数学模型的估计。在巴西，没有直接和连续的测量E，而是使用经验公式来估计降雨强度（I）。因此，使用经验公式从I估计E。为了评估这些变量之间的本地行为，雨变量（能量，体积和强度）和相关的过程（水流量（Q）和悬浮泥沙浓度（SSC））进行了测量在一个小的农村集水区。这项工作是在一个小的农村集水区（1.23平方公里）位于巴西南部，密集的土地使用与烟草种植造成高侵蚀率和泥沙产量。这项研究为研究区域提出了一个替代方程E = f（I），并与Foster等人（1981年）、货车Dijk等人（2002年）、威尔金森（1975年）、Brown和Foster（1987年）以及USDA-ARS（2013年）提出的先前方程进行了比较。此外，这项工作探讨了季节性变化和这些关系的事件的大小的差异。测量的E值与Foster等人（1981）、USDA-ARS（2013）和货车Dijk等人（2002）的公式估计的值相似，而Brown和Foster（1987）低估了E的估计值。最后，评价了总动能、30 min最大雨强（130）和总降雨量（Ptah）在解释考虑Q和SSC的水文产沙过程响应变量中的预报能力。主要成果有：（1）提出了一个新的估算E的方程，该方程基于实测的I值、季节变化和与已知方程的相似性;（2）在流域尺度上，E与水文变量之间的关系。(C)2016爱思唯尔B. V.保留所有权利。
One of the challenges of modern agriculture is to adapting to climatic effects, including the capacity of rainy events in causing erosion. The understanding of these phenomena relies on monitoring rain variables that express the magnitude and pattern of erosive agents. Kinetic energy (E) is a fundamental variable to represent the erosivity and to enable the estimation of erosion and sediment yield in mathematical models. In Brazil, there are no direct and continuous measurements of E, and empirical equations to estimate rainfall intensity (I) are used instead. As a result, empirical equations to estimate E from I are used. To assess local behavior between these variables, rain variables (energy, volume and intensity) and associated processes (water flow (Q) and suspended sediment concentration (SSC)) were measured in a small rural catchment. The work was developed in a small rural catchment (1.23 km2) located in southern Brazil where intensive land use with tobacco cultivation has caused high rates of erosion and sediment yield. This study proposes an alternative equation E = f(I) for the study region and provides a comparison with previous equations already proposed by Foster et al. (1981); van Dijk et al. (2002); Wilkinson (1975); Brown and Foster (1987) and USDA-ARS (2013). Furthermore, this work explores the seasonal variations and the differences in the magnitude of the events of these relationships. The measured E values were similar to those estimated by the equations of Foster et al. (1981); USDA-ARS (2013) and van Dijk et al. (2002), whereas Brown and Foster (1987) underestimate the estimation of E. Finally, it was evaluated the predictive ability of the total kinetic energy, 30 min maximum intensity (130) and total volume of the rainfall (Ptah) in explaining the response variables which reflect the hydrology and sediment yield processes considering the Qand SSC. The main results of the work were: i) a new equation to estimate E based on the I measured, its seasonal variation and similarity with the previously known equations and ii) the relationship between E and the hydrological variables at catchment scale. (C) 2016 Elsevier B.V. All rights reserved.