Effects of irrigation on water and energy balances in the Heihe River basin using VIC model under different irrigation scenarios
Effects of irrigation on water and energy balances in the Heihe River basin using VIC model under different irrigation scenarios
复制标题
利用VIC模型研究不同灌溉情景下灌溉对黑河流域水能平衡的影响
DOI：
10.1016/j.scitotenv.2018.07.254
复制
发表时间：
2018-12-15
影响因子：
9.8
通讯作者：
Zhang, Xiaotao
中科院分区：
文献类型：
--
作者：
Chen, Yuyao;Niu, Jun;Zhang, Xiaotao
大流域水能平衡研究是当前最重要、最具时代性的问题之一，对指导农业生产和区域水资源管理具有重要意义。传统上，水和能量平衡是通过田间试验来评估的。然而，利用有限的田间试验观测数据，要找到适用于整个地区的有效方法并非易事。采用变入渗量模型和灌溉方案，研究了灌溉水对黑河流域上中游地区地表水和能量平衡通量的影响。模型模拟使用了一个测站的径流记录和两个测站的涡动协方差观测进行了校准和验证。此外，还设置了充分灌溉、90%和75%灌溉用水量(IWR)三种灌溉方案。结果表明，入渗曲线参数(B)和下层土壤含水层厚度(d(2))是最敏感的模型参数。长期的灌溉活动会导致更大的蒸散(或潜热)。在考虑2001年至2010年当地灌溉用水系数为0.527的情况下，总灌溉水量约为2.81×10~(9)m~(3)/年，净灌溉水量约为1.48×10~(9)m~(3)/年。与不灌溉基线相比，黑河流域中游近10年来的潜热通量增加(约4.45W/m(2))或波文比显著降低(约1.05)伴随着年平均地表温度(约0.076℃)的降低。(C)2018爱思唯尔B.V.保留所有权利。
Investigations of the water and energy balance in large river basins is one of the most important and contemporary issues, which is helpful to guide agricultural production and regional water resource management. Traditionally, water and energy balance have been assessed by field-scale experiments. However, it is not easy to find the effective ways for a whole region using limited observed data from on-farm experiments. In our study, the effects of irrigation water on surface water and energy balance fluxes are examined by employing the Variable Infiltration Capacity (VIC) model and irrigation scheme, for the upper and middle reaches of the Heihe River Basin in Northwest China. The model simulations are calibrated and validated using both streamflow records at a gauge station and eddy covariance observations at two stations. Besides, three irrigation scenarios are set as full irrigation, 90% and 75% of irrigation water requirement (IWR). The results showed the infiltration curve parameter (b) and the thickness of lower soil moisture layer (d(2)) are the most sensitive model parameters. Long-termirrigation activities lead to a greater evapotranspiration (or latent heat). With considering local irrigation water-using coefficient for the period 2001-2010 of 0.527, the total IWR is about 2.81 x 10(9) m(3)/year (the net IWR is about 1.48 x 10(9) m(3)/year). Compared with the no-irrigation baseline, the increase in latent heat flux (about 4.45 W/m(2)) or the significant decrease in Bowen Ratio (about 1.05) due to full irrigation activities is accompanied by a decrease in annual average surface temperature (about 0.076 degrees C) for the middle reaches of the Heihe River basin during the 10-year period. (C) 2018 Elsevier B.V. All rights reserved.