Ke-Yu Zhao's research while affiliated with China University of Geosciences (Beijing) and other places

Publications (4)

Article
Full-text available
Improved understanding of interactions among the atmosphere, soil water and groundwater can be achieved by observing time-series of soil-water content and water-table fluctuations in a soil profile. Field observations at a site in China show that from mid-June to mid-September, when evapotranspiration is strong, direct groundwater recharge does not...
Article
Full-text available
The Ordos Basin is one of the most intensively studied groundwater basins in China. The Ordos Plateau, located in the north part of the Ordos Basin, is ideal to study the pattern of regional groundwater circulation induced by water-table undulations due to the wavy topography and the relatively simple aquifer systems with macroscopically homogeneou...
Article
As an indispensable component of groundwater circulation, groundwater evapotranspiration rate (ETG) estimation using water table fluctuations is a hot research topic in the past decades. However, most existing methods for estimating ETG using either diurnal or seasonal water table fluctuations are based on the assumptions that groundwater recharge...

Citations

... In the discharge area, as a result of the contribution of lateral groundwater flow from topographic highs towards the lake, the water table is shallow near the lake. The Wudu Lake catchment Zhao et al., 2020) is one of the small catchments located to the southeast of the first-order water divide of the Ordos Plateau. Based on measurements of 53 wells in the catchment (the location of wells can be found in Jiang et al., 2018), water table depth increases from less than 0.5 m in topographic lows to 26.1 m near the divide. ...
... Artesian conditions develop where the hydraulic head of an aquifer is higher than the topographic surface, allowing the free-flow of groundwater through artesian wells (and/or springs). Large artesian systems are widespread, such as the Great Artesian Basin in Australia (Flook et al. 2020;Habermehl 2020), the Dakota Sandstone in the USA (Meinzer and Hard 1925), and the Ordos Plateau in northwestern China (Jiang et al. 2018). Smaller volcanic systems also display artesian conditions, such as the Honolulu artesian basin in Hawaii (USA) (Wentworth 1951) and the volcano-sedimentary aquifer of Pasuruan in Indonesia (Toulier et al. 2019). ...
... The knowledge of shallow water table dynamics is extremely important for the reasonable management of crops and natural vegetation in such areas. Meanwhile, an important hydraulic parameter drainable porosity (also called specific yield in some studies, e.g., in Brutsaert (2005)) is widely used to estimate groundwater recharge, evapotranspiration (ET) and drainage, and also applied in groundwater flow models for an unconfined aquifer (Acharya & Mylavarapu, 2015;Alemie et al., 2019;Jiang et al., 2017;Laio et al., 2009;Troch et al., 2003). Drainable porosity can be defined as the amount of water released from a soil column extending from the ground surface to water table, per unit surface area of per unit drop in the water table (Bear, 1972;Freeze & Cherry, 1979), and can be estimated as (Acharya et al., 2012;Hilberts et al., 2005): ...
... Notwithstanding, Vandenberg (1980) applied and improved the work of Toth (1962) by developing transient model in a unit basin and studied flow field distortion under a periodically changing water table. Additionally, Zhao et al. (2018) extended the work of Toth (1963) by deriving a transient solution under a periodically changing water table in a complex basin and examined the transient behavior of nested flow systems, which was an extended application of Vandenberg (1980) method. Nevertheless, the Tothian theories of groundwater flow in unit basin (Toth 1962) and complex basins (Toth 1963) in most cases assume that water table is always a subdued replica of topography (Haitjema and Mitchell-Bruker 2005). ...