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[1]PENG Ying,LI Shishu,LI Lei.Analysis of Temporal and Spatial Variations of Ecological Water Demand of Jiulong River Basin[J].Research of Soil and Water Conservation,2023,30(01):364-369,378.[doi:10.13869/j.cnki.rswc.20220428.001]

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Analysis of Temporal and Spatial Variations of Ecological Water Demand of Jiulong River Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 01 Page number: 364-369,378 Column: Public date: 2023-01-10

Title:: Analysis of Temporal and Spatial Variations of Ecological Water Demand of Jiulong River Basin

Author(s):: PENG Ying ¹, LI Shishu¹, LI Lei ²; (1.State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; 2.Zhongshui Pearl River Planning & Design Co., Ltd., Guangzhou 510630, China)

Keywords:: Jiulong River Basin; ecological water demand; MODIS; land use type; analysis of temporal and spatial variations

CLC:: X171.1

DOI:: 10.13869/j.cnki.rswc.20220428.001

Abstract:: In order to maintain and protect the ecosystem of a certain region healthy and reverse the degradation, studying and calculating its ecological water demand is necessary. During 2000—2018, based on the data of two hydrological stations, the ecological base flow was determined with the Tennant method, while the area quota method was selected to estimate the ecological water demand of vegetation. The distribution map of soil texture, as well as the remote-sensing based MCD12Q1 land use types product and MOD16A2 evapotranspiration product were selected as inputs of the area quota method. The temporal changing trend and spatial distribution of ecological water demands over the whole watershed were analyzed. The results showed that:(1)during 2000—2018, the areas of forestland, grassland in overall increased, while the area of cropland and sparse woods decreased;(2)the instream ecological water requirements of North River and West River were 2.268 billion m³, 1.067 billion m³, respectively, and ecological water requirement of vegetated area was total 10.527 billion m³;(3)the ecological water requirements of forestland and grassland increased significantly, while those of open woodland and cropland decreased significantly and insignificantly, respectively. Affected by human activities, the interannual change of land cover/land use in Jiulong River Basin was obvious, hence it could not be ignored in reckoning regional ecological water demand, and with the development of RS/GIS technology, it could be convenient to obtain land cover/land use data and evapotranspiration data in high space-time resolution, which is useful for predicting the regional ecological water demand.

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Last Update: 2023-01-10