The Tunisian oases face serious problems of waterlogging and salinization caused by mismanagement of water and soil resources and the reduced discharge of drainage water. The oases space is based on a fragile balance ...The Tunisian oases face serious problems of waterlogging and salinization caused by mismanagement of water and soil resources and the reduced discharge of drainage water. The oases space is based on a fragile balance between water, soil and man, which is now changed by modem irrigation and drainage systems. The oases pump most of their water from deep aquifers and only to a small degree from shallow aquifers. The quality of the irrigation water and the presence of a shallow saline water table are the main causes of salinization of the oases. Concerning the salt-affected landscapes and hydro-saline dynamic, the authors distinguish an equilibrium dynamic of salts to the parcel which depends on water management, and an equilibrium dynamic at the level of the basin watershed which is powered by drilling and ending in hypersaline depressions. For the management of salinization and waterlogging, a combination of agricultural management techniques are used, the first being modem methods of irrigation and drainage. Other, less used methods are sandy amendment, the reuse of drainage waters, geothermal waters and of treated wastewater.展开更多
To meet the demand of urban rainwater integrated management,we designed and complemented a physical simulation experimental system of urban rainfall infiltration regulation parameters.We discuss the feasibility of qua...To meet the demand of urban rainwater integrated management,we designed and complemented a physical simulation experimental system of urban rainfall infiltration regulation parameters.We discuss the feasibility of quantitative regulations of urban underlying surface rainfall infiltration conditions and a practical application of a simulated experimental system.In a com- prehensive analysis of the composition of an effective rainwater harvesting system and selection of water storage material,we simulated the major parameters of an experimental area rainfall,soil moisture and water storage capacity by providing an effective regulation of the experimental area runoff coefficient,obtained from basic data.展开更多
文摘The Tunisian oases face serious problems of waterlogging and salinization caused by mismanagement of water and soil resources and the reduced discharge of drainage water. The oases space is based on a fragile balance between water, soil and man, which is now changed by modem irrigation and drainage systems. The oases pump most of their water from deep aquifers and only to a small degree from shallow aquifers. The quality of the irrigation water and the presence of a shallow saline water table are the main causes of salinization of the oases. Concerning the salt-affected landscapes and hydro-saline dynamic, the authors distinguish an equilibrium dynamic of salts to the parcel which depends on water management, and an equilibrium dynamic at the level of the basin watershed which is powered by drilling and ending in hypersaline depressions. For the management of salinization and waterlogging, a combination of agricultural management techniques are used, the first being modem methods of irrigation and drainage. Other, less used methods are sandy amendment, the reuse of drainage waters, geothermal waters and of treated wastewater.
基金Projects 40371113 supported by the National Natural Science Foundation of ChinaOF060096 by the Youth Scientific Foundation of China University of Mining & Technology
文摘To meet the demand of urban rainwater integrated management,we designed and complemented a physical simulation experimental system of urban rainfall infiltration regulation parameters.We discuss the feasibility of quantitative regulations of urban underlying surface rainfall infiltration conditions and a practical application of a simulated experimental system.In a com- prehensive analysis of the composition of an effective rainwater harvesting system and selection of water storage material,we simulated the major parameters of an experimental area rainfall,soil moisture and water storage capacity by providing an effective regulation of the experimental area runoff coefficient,obtained from basic data.
