Four images of 1991 AVHRR, 2003 and 2007 MODIS were used to extract waterlogging inundated water of three years, and three inundated water maps were overlaid to estimate waterlogging affected frequency. Based on wa-te...Four images of 1991 AVHRR, 2003 and 2007 MODIS were used to extract waterlogging inundated water of three years, and three inundated water maps were overlaid to estimate waterlogging affected frequency. Based on wa-terlogging affected frequency, waterlogging hazard of pixel scale was assessed. According to the weighed score of area percentage of different waterlogging affected frequency in 13 counties/cities of Lixiahe region, waterlogging hazard rank of every county/city was assessed. Waterlogging affected frequency map and 1km×1km grid landuse map were used to assess waterlogging risk of pixel scale; and then waterlogging risk rank of every county/city was assessed by the similar method by which waterlogging hazard rank of every county/city was assessed. High risk region is located mainly in core zone of Lixiahe hinterland, medium risk region is adjacent to high risk region, and low risk region is located in the most outlying area of risk zone and mainly in south to middle part of Lixiahe region. Xinghua and Gaoyou belong to high risk city, Jiangyan belongs to medium risk city, and the other counties/cities have low or lower waterlogging risk. The method of assessing waterlogging risk in this paper is simple and applicable. This paper can provide guidance for the waterlogging risk analysis in broader area of Huaihe River Basin.展开更多
The paper deals with a transformation model of a backward distric into a prosperous one. The district is geographically located in Lixiahe region, Jiangsu Province. The region had long ben known as one of the poorest ...The paper deals with a transformation model of a backward distric into a prosperous one. The district is geographically located in Lixiahe region, Jiangsu Province. The region had long ben known as one of the poorest area in China, and had been alternatively attacked by flood, waterlogging, drought, salinzation, and plague of insect. Since the seventies of this centruy efforts to open up trenches on lowland and to level up the shoaly land have been made. A kind of tree, which is tolerable to high watertable, was used to afforest the land. Cereal crop, vegetable and beaus are grown. In some cases, the shoaly land is used for sheep grazing and fishery. A favorable combination of forestry, agriculture, animal husbandry and fishery has been set up in the region. There are five type of managements in the system: 1) forestry-agriculture comPlex management. 2) forestry-fishery complex management, 3) forestry-aquatic plan-fishery complex management, 4) forestry-animal husbandry complex management, and 5) forestry-edible mushroom complex management. The principles and ecological benefits of this system can be identitied: 1) Increase soil fertility by piling mud from marsh land on top soil, and thicken the arable layer. 2) Enhance the utilization rate of sunlight and energy, due to the change of microclimate in field. 3) As a result of multiple layer cultivation and multi-cropping, the production has been greatly increased. 4) Accelerate the cycling of matter and conversion of energy and nutrient of the system. 5) Decrease the consUmption of soil fertility and increase the capability of controlling insect pests. 6) Improve ecological environment by afforestationl. 7) Raise income and provide jobs for local peasants, even some ones from other part of this province.展开更多
Lixiahe region is one of the susceptible area to flood and waterlogging disasters in China due to its low topographic relief and having difficulty in draining floodwater away.The condition will be more serious if sea ...Lixiahe region is one of the susceptible area to flood and waterlogging disasters in China due to its low topographic relief and having difficulty in draining floodwater away.The condition will be more serious if sea level rises in the future.The estimated results by some scientists indicate that the sea level could rise probably 20-100 cm by 2050.However,what the effect will future sea level rise exerts on flood drainage and on flood or waterlogging disasters? A hydrological system model has been developed to study the problem in the lower reaches of the Sheyang River basin.Predicted results from the model show that,if sea level rises,drainage capacity of each drainage river will decrease obviously,and the water level will also rise.From the change of drainage capacity of drainage rivers the trends of flood and waterlogging disasters are analyzed in the paper if the severe flood that happened in the past meets with future sea level rise.Some countermeasures for disaster reduction and prevention against sea-level rise are put forward.展开更多
基金Under the auspices of Ministry of Water Resources, P. R. China (No. [2001]29)
文摘Four images of 1991 AVHRR, 2003 and 2007 MODIS were used to extract waterlogging inundated water of three years, and three inundated water maps were overlaid to estimate waterlogging affected frequency. Based on wa-terlogging affected frequency, waterlogging hazard of pixel scale was assessed. According to the weighed score of area percentage of different waterlogging affected frequency in 13 counties/cities of Lixiahe region, waterlogging hazard rank of every county/city was assessed. Waterlogging affected frequency map and 1km×1km grid landuse map were used to assess waterlogging risk of pixel scale; and then waterlogging risk rank of every county/city was assessed by the similar method by which waterlogging hazard rank of every county/city was assessed. High risk region is located mainly in core zone of Lixiahe hinterland, medium risk region is adjacent to high risk region, and low risk region is located in the most outlying area of risk zone and mainly in south to middle part of Lixiahe region. Xinghua and Gaoyou belong to high risk city, Jiangyan belongs to medium risk city, and the other counties/cities have low or lower waterlogging risk. The method of assessing waterlogging risk in this paper is simple and applicable. This paper can provide guidance for the waterlogging risk analysis in broader area of Huaihe River Basin.
文摘The paper deals with a transformation model of a backward distric into a prosperous one. The district is geographically located in Lixiahe region, Jiangsu Province. The region had long ben known as one of the poorest area in China, and had been alternatively attacked by flood, waterlogging, drought, salinzation, and plague of insect. Since the seventies of this centruy efforts to open up trenches on lowland and to level up the shoaly land have been made. A kind of tree, which is tolerable to high watertable, was used to afforest the land. Cereal crop, vegetable and beaus are grown. In some cases, the shoaly land is used for sheep grazing and fishery. A favorable combination of forestry, agriculture, animal husbandry and fishery has been set up in the region. There are five type of managements in the system: 1) forestry-agriculture comPlex management. 2) forestry-fishery complex management, 3) forestry-aquatic plan-fishery complex management, 4) forestry-animal husbandry complex management, and 5) forestry-edible mushroom complex management. The principles and ecological benefits of this system can be identitied: 1) Increase soil fertility by piling mud from marsh land on top soil, and thicken the arable layer. 2) Enhance the utilization rate of sunlight and energy, due to the change of microclimate in field. 3) As a result of multiple layer cultivation and multi-cropping, the production has been greatly increased. 4) Accelerate the cycling of matter and conversion of energy and nutrient of the system. 5) Decrease the consUmption of soil fertility and increase the capability of controlling insect pests. 6) Improve ecological environment by afforestationl. 7) Raise income and provide jobs for local peasants, even some ones from other part of this province.
文摘Lixiahe region is one of the susceptible area to flood and waterlogging disasters in China due to its low topographic relief and having difficulty in draining floodwater away.The condition will be more serious if sea level rises in the future.The estimated results by some scientists indicate that the sea level could rise probably 20-100 cm by 2050.However,what the effect will future sea level rise exerts on flood drainage and on flood or waterlogging disasters? A hydrological system model has been developed to study the problem in the lower reaches of the Sheyang River basin.Predicted results from the model show that,if sea level rises,drainage capacity of each drainage river will decrease obviously,and the water level will also rise.From the change of drainage capacity of drainage rivers the trends of flood and waterlogging disasters are analyzed in the paper if the severe flood that happened in the past meets with future sea level rise.Some countermeasures for disaster reduction and prevention against sea-level rise are put forward.
