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Northwest Agriculture and Forestry University (2019)

Attribution Analysis of Terrestrial Water Storage and Estimating Groundwater Recharge at Regional Scale on the Loess Plateau

吴奇凡;

Titre : Attribution Analysis of Terrestrial Water Storage and Estimating Groundwater Recharge at Regional Scale on the Loess Plateau

Auteur : 吴奇凡;

Grade : Doctoral Dissertation 2019

Université : Northwest Agriculture and Forestry University

Résumé partiel
As the most populous country and the second largest economic entity in the world,how to sustainably use and manage water resources is a key issue for both China and the world,and is of great significance to global food security,human health and social stability.In order to improve the ecological environment of the Loess Plateau and control soil erosion,the Chinese government has implemented Grain for Green Project since 1999,which is the largest ecological restoration project in the world.The vegetation coverage of the Loess Plateau has doubled by 2013,and the amount of sediment transport in the Yellow River has reduced to the level of the Tang Dynasty farming era.However,the excessive water depletion by reforestation has caused a series of ecological issues including soil desiccation in the water-limited region.Previous studies have investigated the variation of terrestrial water storage and groundwater recharge from the point scale measurements,but few studies have been conducted at regional scales due to the lack of methods and data.To better understand the spatio-temporal changes of water resources at the regional scale of the Loess Plateau.Three studies were performed :(1)the terrestrial water storage products from Texas State University Space Research Center(CSR),the US Jet Propulsion Laboratory(JPL),and the Goddard Space Flight Center(GSFC)retrieved with the GRACE satellites based Mascons method(abbreviated to as CSR-M,JPL-M and GSFC-M,respectively)were used to figure out the time series and spatial variation of terrestrial water reserves on the Loess Plateau ;(2)data including paired experiments of the forest and grassland,land use change data,normalized difference vegetation index(NDVI),coal mining data,groundwater level monitoring data as well as the global land data assimilation system(GLDAS)were used to find out the underlying reasons accounting for the terrestrial water storage change at regional scales ;(3)a new groundwater storage fluctuation method based on GRACE data was developed to estimate the groundwater recharge(GR)at regional scale.The main results are as follows :(1)The terrestrial water storage of the Loess Plateau calculated by CSR-M,JPL-M and GSFC-M showed a decline trend during the investigated time period with reduced amount of6.1±0.9 mm,6.8±1 mm and 10.7±1 mm,respectively.All the three products can reflect the decline trend of terrestrial water reserves,but their capabilities to represent this trend are gradually weakened from southeast to northwest.A good consistency in regional average and spatial variation was observed between the CSR-M and JPL-M,but the GSFC-M performed quite differently from the other two products

Mots clés : GRACE; Deep soil water storage; Groundwater recharge; Regional scale; Loess Plateau;

Présentation (CNKI)

Page publiée le 5 mai 2020