• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Transactions of the ASABE >Mapping spatially interpolated precipitation, reference evapotranspiration, actual crop evapotranspiration, and net irrigation requirements in Nebraska: Part I. Precipitation and reference evapotranspiration.
【24h】

Mapping spatially interpolated precipitation, reference evapotranspiration, actual crop evapotranspiration, and net irrigation requirements in Nebraska: Part I. Precipitation and reference evapotranspiration.

机译：绘制内布拉斯加的空间插值降水，参考蒸散量，实际作物蒸散量和净灌溉要求的地图：第一部分。降水和参考蒸散量。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Precipitation and reference evapotranspiration are two important variables in hydrologic analyses, agricultural crop production, determining actual crop evapotranspiration and irrigation water requirements, and irrigation management. Both variables vary in space and time, and the weather networks that measure or quantify and report both variables are too sparse for practical applications by water resources planners, managers, and irrigators. Long-term (1986-2009) average annual (January to December), seasonal (growing season, May to September), and monthly (May, June, July, August, and September) precipitation and Penman-Monteith-estimated alfalfa-reference evapotranspiration (ETref) were spatially interpolated and mapped for all 93 counties in Nebraska using the spline interpolation technique in ArcGIS. Precipitation gradually increased from the western part and southwest corner (zone 1) to the eastern part (zone 4) of the state. Long-term average county annual precipitation ranged from 325 to 923 mm, with a statewide mean of 581 mm. The long-term average seasonal precipitation showed a similar trend as the annual precipitation and ranged from 215 to 601 mm, with a statewide average of 380 mm. Based on the annual average precipitation data, there was an approximately 30 mm decrease in precipitation for every 40 km from east to west. Seasonal and annual precipitation were inversely proportional to elevation with high coefficients of determination (R2=0.94 for annual and R2=0.88 for seasonal). Annual precipitation decreased between 18 and 131 mm for every 100 m increase in elevation. Seasonal precipitation decreased between 11 and 72 mm for every 100 m increase in elevation. The long-term statewide average annual ETref was 1,400 mm, with significant differences across the state: 1,662 mm (zone 1), 1,542 mm (zone 2), 1,350 mm (zone 3), and 1,285 mm (zone 4). The statewide long-term average seasonal ETref was 883 mm, with a maximum of 1,087 mm and minimum of 684 mm. The maximum monthly ETref of 268 mm was observed in July, and the minimum value of 12 mm was observed in December. The annual ETref increased by 47 mm for every 100 m increase in elevation, and the seasonal ETref increased by 29 mm for every 100 m increase in elevation. Spatially interpolated maps of precipitation and ETref can provide important background information and physical interpretation of precipitation and ETref for climate change studies in the region, which can lead to the ability to take proactive steps to balance water supply and demand through various available methods, such as changing cropping patterns to implement cropping systems with lower water demand, reduced tillage practices to minimize unbeneficial water use (soil evaporation), implementing newer drought-tolerant crop hybrids and cultivars, implementing deficit irrigation strategies, and initiating and deploying more aggressive and effective irrigation management programs.
机译：降水量和参考蒸散量是水文分析中的两个重要变量，包括农作物产量，确定实际的作物蒸散量和灌溉用水需求以及灌溉管理。这两个变量在空间和时间上都不同，并且测量，量化和报告这两个变量的天气网络对于水资源规划人员，管理人员和灌溉人员的实际应用而言过于稀疏。长期（1986-2009）年平均（1月至12月），季节性（生长季节，5月至9月）和每月（5月，6月，7月，8月和9月）降水和Penman-Monteith估计的苜蓿参考使用ArcGIS中的样条插值技术对内布拉斯加州所有93个县的蒸散发量（ET ref ）进行了空间插值和映射。从该州的西部和西南角（1区）到东部（4区），降水逐渐增加。县的长期平均年降水量在325至923毫米之间，全州平均水平为581毫米。长期平均季节降水量显示与年降水量相似的趋势，范围为215至601毫米，全州平均水平为380毫米。根据年平均降水量数据，东西向每40 km降水量减少约30 mm。季节和年降水量与海拔成反比，具有较高的确定系数（年R 2 = 0.94，季节R 2 = 0.88）。海拔每增加100 m，年降水量就会减少18至131 mm。海拔每增加100 m，季节性降水就会减少11至72 mm。全州的长期平均年平均ET ref 为1,400 mm，各州之间存在显着差异：1,662 mm（1区），1,542 mm（2区），1,350 mm（3区）和1,285毫米（4区）。全州长期平均季节性ET ref 为883毫米，最大1,087毫米，最小684毫米。在7月观察到的最大月ET ref 为268 mm，在12月观察到的最小值为12 mm。海拔每升高100 m，年ET ref 增加47毫米，而海拔每升高100 m，季节性ET ref 增加29 mm。降水量和ET ref 的空间内插图可以为该地区的气候变化研究提供重要的背景信息以及降水量和ET ref 的物理解释，从而可以提高采取积极措施，通过各种可用方法来平衡供需，例如改变种植方式以实施水需求量较低的种植系统，减少耕作方式以最大程度地减少无益用水（土壤蒸发），实施更新的耐旱作物杂交种和品种，实施赤字灌溉策略，并启动和部署更积极有效的灌溉管理计划。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号