Knowledge Resource Center for Ecological Environment in Arid Area
| LAND-USE PLANNING: ELABORATION OF THE HIDRIC EROSION HAZARD MAP AND APLICATION OF MORPHOMETRICAL PARAMETERS | |
| Navarro, Edgardo | |
| 通讯作者 | Navarro, E |
| 来源期刊 | BOLETIM PARANAENSE DE GEOCIENCIAS
 |
| ISSN | 0067-964X |
| 出版年 | 2006 |
| 卷号 | 58页码:45-58 |
| 英文摘要 | The studied area is about 105.803 hectares and comprises the Auca Mahuida Protected Natural Reserve. It is located in the east-northeast of Neuquen Province, Argentina. Population density ranges between 0.4 and 0.7 inhabitants per square kilometre and meteorological and hydrogeological data are absent The surface geology comprises Neogene volcanic rocks overlaying subhorizontal Cretaceous sedimentary rocks of the Neuquen Group. The climatic conditions are extremely arid and the soils over bedrock are shallow, consequently, the landscape is very breakable. These conditions are increased by the economic activities in the region, mainly including hydrocarbon and farm works, which produce degrading effects against the environment. Particularly, the seismic lines of hydrocarbons exploration, with removal of the superficial cover, are important features where the hidric erosion might carried out (figure 3a and 3b). The length of the measured lines from the satellital image in the Reserve, reach 1100 kilometre, which means a density of 10.4 meter per hectares. The aim of this paper is to delimit different zones according to the expected intensity of the erosion processes. These zones contribute to locate areas of special hazard where erosion could be increased substantially, by extending sheet erosion, headward erosion of gullies or gully branching. The elaboration of the erosion hazard map was based on different aspects. First, on combinations of permanent erosion factors, inclination of slope, soil profile properties and lithology. And second, according the physiography of the region, considering the variable factors natural vegetation cover, activities of the population and free soil percentage following Bergsma (1983). All data were processed with Geographic Information System (GIS) using the software Idrisi32. In the studied area, only the small scale topographic data (1:250000) were available, and the slope of the small landforms can not be recognized. Therefore, the drainage network observed in the aerial photographs and satellital imagery were used to estimate slope steep degree. The drainage network was drew using fifty one stereoscopic aerial photograph, scale 1:60000 and, the density of drainage parameter was measured within a grid of 1.2 square kilometre per 1.2 square kilometre. Considering the lithology, landscape of the area, the stereoscopic observations and the measured at ground controls points, a correlation between drainage density and slope steep degree was found. The drainage density turned out an important complement of topographic map and constituted a good reference in order to delimit the areas with different steep degree. Three qualitative classes of erosion hazard were recognized in the Auca Mahuida area: optimum, acceptable and minimun, considering the methodology of land-use planning of Crozier et al (1974) and Robinette y Crozier (1976). The classification indicates the degree of protection needed, as the erosion hazard decrease from maximum to minimum. The combination of the different erosion hazard factors, mainly relief, soil properties, free soil percentage (very important in the region) and natural vegetation allowed to delimit sectors which include the following units of erosion hazard: 21.372 hectares (20.2%) comprises the optimum class, 18.832 hectares (17.8%) the acceptable class and (62.0%) the minimum class. The different units herein delimited were outlined in a map, providing the basis for a land-use planning and to prevent the erosion in susceptible areas, which are priorities for the conservation (figure 4). |
| 英文关键词 | land-use planning hidric erosion hazard drainage density Auca Mahuida Argentina |
| 类型 | Article |
| 语种 | 葡萄牙语 |
| 收录类别 | ESCI |
| WOS记录号 | WOS:000450746600003 |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS研究方向 | Geology |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/328835 |
| 作者单位 | [Navarro, Edgardo] Univ Nacl Sur, Dept Geol, PAID Comis Invest Cient Prov Buenos Aires, San Juan 670, RA-8000 Bahia Blanca, Buenos Aires, Argentina |
| 推荐引用方式 GB/T 7714 | Navarro, Edgardo. LAND-USE PLANNING: ELABORATION OF THE HIDRIC EROSION HAZARD MAP AND APLICATION OF MORPHOMETRICAL PARAMETERS[J],2006,58:45-58. |
| APA | Navarro, Edgardo.(2006).LAND-USE PLANNING: ELABORATION OF THE HIDRIC EROSION HAZARD MAP AND APLICATION OF MORPHOMETRICAL PARAMETERS.BOLETIM PARANAENSE DE GEOCIENCIAS,58,45-58. |
| MLA | Navarro, Edgardo."LAND-USE PLANNING: ELABORATION OF THE HIDRIC EROSION HAZARD MAP AND APLICATION OF MORPHOMETRICAL PARAMETERS".BOLETIM PARANAENSE DE GEOCIENCIAS 58(2006):45-58. |
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