Using bromide data tracer and HYDRUS-1D to estimate groundwater recharge and evapotranspiration under film-mulched drip irrigation in an arid Inland Basin, Northwest China
Using bromide data tracer and HYDRUS-1D to estimate groundwater recharge and evapotranspiration under film-mulched drip irrigation in an arid Inland Basin, Northwest China
复制标题
利用溴化物示踪剂和HYDRUS-1D估算西北干旱内陆盆地覆膜滴灌地下水补给和蒸散量
DOI：
10.1002/hyp.14290
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发表时间：
2021-07-01
影响因子：
3.2
通讯作者：
Ferre, Ty P. A.
中科院分区：
文献类型：
--
作者：
Chen, Wenling;Wang, Jianjun;Ferre, Ty P. A.
地下水补给量（GR）和蒸散量（ET）的准确估算对于地下水资源的可持续管理至关重要，特别是在干旱和半干旱地区。玛纳斯河流域严重依赖地下水，水资源短缺是制约该流域灌溉农业可持续发展的主要因素。膜下滴灌显著改变了包气带水分运动的格局和主导过程，增加了估算土壤GR和ET的难度。为了更好地估算膜下滴灌的土壤GR和ET，在12个有代表性的地点进行了溴离子示踪试验和土壤岩性调查。一个一维饱和流模型（HYDRUS-1D）进行了校准，在每个站点使用土壤蒸发数据推断溴示踪剂试验。结果表明，未开垦地土壤蒸发量为25.55mm，膜下滴灌条件下土壤年平均蒸发量为5.5 ~ 37.0mm。年蒸散量在507.0 ~ 747.1mm之间，土壤蒸发量在35.7 ~ 117.0mm之间，蒸腾量在460.9 ~ 642.3mm之间，土壤蒸发量占蒸散总量的7%~ 16%，降水和灌溉水的70%以上被棉花利用。土壤岩性、地下水位埋深和土壤初始含水量的空间变异导致了MRB中GR和ET的空间差异。我们的研究表明，溴离子示踪试验是有用的推断在干旱和半干旱绿洲ET。溴化物示踪试验和HYDRUS-1D相结合，提高了可靠性估计GR和ET膜下滴灌在MRB和显示的承诺，为世界各地的其他类似的干旱内陆盆地。
Accurate estimation of groundwater recharge (GR) and evapotranspiration (ET) are essential for sustainable management of groundwater resources, especially in arid and semi-arid regions. In the Manas River Basin (MRB), water shortage is the main factor restricting sustainable development of irrigated agriculture, which relies heavily on groundwater. Film-mulched drip irrigation significantly changes the pattern and dominant processes of water flow in the unsaturated zone, which increases the difficulty of GR and ET estimation. To better estimate GR and ET under film-mulched drip irrigation in the MRB, bromide tracer tests and soil lithologic investigation were conducted at 12 representative sites. A one-dimensional variably saturated flow model (HYDRUS-1D) was calibrated at each site using soil evaporation data inferred from the bromide tracer tests. The results showed that average annual soil evaporation in uncultivated lands calculated from bromide trace tests was 25.55 mm. The annual GR ranged from 5.5 to 37.0 mm under film-mulched drip irrigation. The annual ET ranged from 507.0 to 747.1 mm, with soil evaporation between 35.7 and 117.0 mm and transpiration between 460.9 and 642.3 mm. Soil evaporation represented 7% to 16% of the total ET and more than 70% of precipitation and irrigation water was used by cotton plants. Spatial variations of soil lithology, water table depth and initial soil water content led to the spatial differences of GR and ET in the MRB. Our study indicated that bromide tracer tests are useful for inferring ET in the arid and semi-arid oases. The combination of bromide tracer tests and HYDRUS-1D enhances reliability for estimation of GR and ET under film-mulched drip irrigation in the MRB and shows promise for other similar arid inland basins around the world.