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Copyright of Bulletin of Soil & Water Conservation is the property of Bulletin of Soil & Water Conservation Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

【Objective】 Hetao Irrigation District relies on Yellow River water for irrigation, but excessive use of the river water had resulted in soil salinity. Jointly using groundwater and river water has been postulated as a feasible mitigation technology, and the purpose of this paper is to present the results of a study on how to achieve optimal use of groundwater and surface water. 【Method】 A three-dimensional groundwater model for the region was calibrated and verified using MODFLOW based on measured groundwater depths and other datasets. We then applied the model to four typical well-canal combination areas in four sub-districts: Wulanbuhe, Jiefangzha, Yongji and Yichang. 44 scenarios with four different well-irrigation areas and 11 kinds of canal-well combination ratios were considered. For each scenario, we predicted how the groundwater depth changed with the well-canal combination ratio and well-irrigation area. 【Result】 ①The three-dimensional groundwater model correctly captured physical properties of the aquifers and soils and reproduced the observed change in groundwater depth at different scenarios. ②When the ratio of well-irrigated to canal- irrigated areas was the same, the average groundwater depth in Jiefangzha and Wulanbuhe was the shallowest followed by Yongji, with that in Yichang the deepest. Isograms of groundwater depth in areas with well-canal irrigation in Wulanbuhe was the densest, followed by Yichang, with Yongji and Jiefangzha the sparsest. ③When the well-irrigated area was constant, the average groundwater depth decreased asymptotically as the canal-well combination ratio increased. 【Conclusion】 The suitable canal-well combination ratio and well-irrigation area for controlling groundwater depth not exceeding 3 m varied with the sub-districts due to their difference in hydrogeological conditions. The well-irrigation areas in Wulanbuhe, Jiefangzha, Yongji and Yichang should not exceed 12.25 km2, 12.25 km2, 9 km2 and 6.25 km2 respectively, with their associated ratio of canal-irrigated area to well- irrigation area not exceeding 2.5, 2.5, 3.0 and 3.3 respectively.

On the basis of fully analyzing the process structure of groundwater management model, by coupling the groundwater flow model MODFLOW and Genetic Algorithm (GA) optimization algorithm, an adaptive penalty function GA algorithm was proposed for the solution of groundwater management model. Groundwater flow model was integrated into the optimization algorithm and the groundwater model modeling results were used as the constraint conditions in the optimization algorithm, which was solved by the GA. Case study shows that the penalty factors can be determined autonomously, which overcomes the difficulty of selecting the suitable penalty factors in traditional GA; it can be guaranteed to obtain the global optimal solution in the feasible region; compared with the traditional GA, the proposed algorithm can obtain more accurate solution. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Engineering Geology / Gongcheng Dizhi Xuebao is the property of Journal of Engineering Geology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Hydrogeology & Engineering Geology / Shuiwendizhi Gongchengdizhi is the property of Hydrogeology & Engineering Geology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With the help of a three dimensional mathematical model of groundwater of Modflow, the high-efficiency agriculture park in Yuyao City was chosen as study area to research the groundwater dynamic regulation under various rainfall recharges, on the basis of collecting fundamental information of the park and conducting hydro-geological investigation. According to the hydrodynamic processes of groundwater level under different designed rainfall events and water-level control boundaries in rivers as well as different pipe drainage schemes, the relationship between groundwater level regulation and depth and spacing of drainage pipes was analyzed, and then groundwater dynamic drainage system was determined. The result shows that the optimized drainage scheme is the pipe drainage system with space width 15 m and 2.5 m for depth. The drainage rule for the shallow groundwater at complex hydrogeological region was explored, which will provide scientific decision-making reference for groundwater level control of precision agriculture and prevention and cure of soil salinization. [ABSTRACT FROM AUTHOR]