30 results about "Watershed scale" patented technology

The invention discloses a watershed scale soil moisture remote sensing data assimilation method belonging to the field of remote sensing data assimilation methods. The method comprises the following steps of: (A) preparing for data; (B) constructing a watershed soil moisture assimilation observation operator; (C) constructing a distributed hydrologic model assimilation platform; and (D) constructing a watershed soil moisture remote sensing data assimilation scheme based on a distributed hydrologic model and particle filter assimilation algorithm. In the invention, a novel distributed watershed hydrologic model which is capable of effectively fusing microwave remote sensing information and has a certain physical basis is constructed by utilizing soil water hydrodynamic method and combining a saturation excess runoff principle, a hydrological simulation detection result of the Yi River watershed in a typical semi-arid and semi-humid area shows that the novel distributed watershed hydrologic model has a better daily runoff simulation effect and stable surface soil moisture simulation precision and can be used as a watershed soil moisture remote sensing data assimilation model operator. By using the watershed scale soil moisture remote sensing data assimilation method, a watershed scale soil moisture assimilation data set in temporal and spatial distribution can be acquired effectively.

The invention discloses a multi-center watershed water environment distributed cluster management system and method. The system creates a system operation management center, a numerical simulation center, a data center, a decision command center and a client-side service center, all of which are of different management levels and function levels. By means of division and cooperation of the different centers, computer resources of centers of units of the watershed water environment can be integrated, a resource pool is formed, services are provided according to demands of functions of the centers of the units of the watershed, the problems, such as waiting time losses, the low watershed scale simulation computing speed, low efficiency and resource waste for repeated construction, of a traditional watershed model system due to serial computation can be solved, the watershed water environment simulation efficiency is greatly improved, hardware resources and data resources of the whole watershed are integrated, water environment management, current situation evaluation, future trend prediction and sudden event emergence simulation and decision support of the whole watershed are achieved, and safety of the watershed water environment is guaranteed.

The invention discloses a large watershed-scale water and nitrogen migration coupling simulation method, including S1, according to the surface hydrological process, combined with the total amount of surface nitrogen, respectively calculating the loss with surface runoff and infiltration to the surface due to nitrogen deposition and fertilization. Soil and dissolved nitrogen content stored in surface depressions; S2. Based on the soil hydrological process, calculate the source-sink term, and use the convection-dispersion equation to calculate the nitrogen concentration in each layer of the soil according to the source-sink term; S3. Based on the groundwater hydrological process, Use the mass conservation equation to calculate the nitrogen concentration in the groundwater; S4. Calculate the nitrogen concentration in the slope ditch by using the convection-dispersion equation according to the hydrological process of the slope ditch; S5. Calculate the nitrogen concentration in the river section by using the convection-diffusion equation according to the hydrological process of the river channel. The advantages are: the accuracy of hydrological process simulation is improved, and the channel cross-section flow and the concentration of pollutant nitrogen during the permafrost thawing period can be well simulated.

The invention discloses a method and device for selecting spatial scales of mass landslides. Through high-precision digital elevation models and landslide spatial data, the ArcGIS spatial correlation analysis method is used, and the geographical location expression degree, information expression degree, and spatial correlation index are used. , taking the small watershed with clear physical meaning as the basic unit, analyzing the relationship curve between the index and the value, and defining the small watershed scale that is most suitable for the analysis of mass landslides, it can be widely used in landslide spatial information extraction, risk assessment, disaster warning and forecasting, Disaster prevention and other aspects, has important theoretical and practical significance.

The invention relates to a watershed-scale hydrological nonconformity diagnosis method. The method includes the following steps that: a watershed non-uniform indicator system is built; nonconformity diagnosis is performed on single indicator sequences; and watershed hydrological nonconformity quantitative diagnosis is performed. According to the method, the indicator sequences representing the developmental characteristics of hydrological processes are screened out, and the indicator sequences are classified and combined according to an indicator-element-target level; whether the sequences are in trend variation states or jump variation states can be judged on the whole; after nonconformity diagnosis is performed on each single indicator sequence, comprehensive nonconformity diagnosis is performed on each indicator, and therefore, defects in corresponding aspects in the prior art can be avoided; and nonconformity judgment is performed on the plurality of indicators with the same standard, and therefore, theoretical support can be provided for a plurality of kinds of application, such as water resource diagnosis, reservoir dispatching, water conservancy engineering design, flood control and fight against drought.

A downscaling method for a soil water content product is disclosed. The method includes A) acquiring passive microwave soil water content products of a region to be researched and optical remote sensing data at the same time, B) subjecting the optical remote sensing data to soil spectrum extraction based on a multiple endmember spectral mixture analysis process, C) building a model of a quantitative relation between soil spectrum reflection characteristics and soil water contents acquired from the passive microwave soil water content products by utilizing GA-PLS, and D) based on the model of the quantitative relation, building a soil water content downscaling model by utilizing the Taylor series expansion and acquiring soil water content data having a high spatial resolution. Advantages of passive microwave remote sensing data and optical remote sensing data on the temporal-spatial resolution are utilized in the method, and the passive microwave remote sensing data and the optical remote sensing data are effectively combined to acquire the soil water content data having the high spatial resolution, and therefore large-scale watershed scale region researching can be met, real-time or quasi real-time dynamic monitoring on watershed scale soil water contents is achieved, accuracy is high, building is easy and time and labor are saved.