32 results about "Floodplain" patented technology

A method, apparatus, and article of manufacture provide the ability to define a floodplain encroachment. River reach and station information are received into a geographic information system (GIS). Floodplain encroachment values are defined using a graphical user interface (GUI). The GUI provides a simultaneous view of station identifiers for each station for which the floodplain encroachment is to be defined, profiles defined for each of the station identifiers, a method identification corresponding to each of the defined profiles, and a target water surface elevation change for each profile. The values are provided to a HEC-RAS engine which outputs analysis results that are simultaneously displayed in the GUI with the other information. The analysis results include a water surface elevation change, a top width, and a velocity for each profile-station pair. Users can modify the values and dynamically view the results from HEC-RAS in the GUI.

The invention discloses an automatic identification method for a floodplain and a main channel in a compound-section channel. The method comprises the following steps of: selecting a lowest-point elevation and a highest-point elevation of a compound section; taking the lowest-point elevation and the highest-point elevation as the lowest water level and the highest water level of section overflowing; from the highest water level, uprising for 0.05m every time until reaching the highest water level; calculating a section overflowing area and a wetted perimeter corresponding to each water level, determining a corresponding hydraulic radius, and establishing relation curves of the water levels and the hydraulic radiuses; based on characteristics of the curves, calculating the difference value of the hydraulic radiuses corresponding to two adjacent water levels according to the water levels from low to high, setting the critical values of hydraulic radius amplitudes, capturing sudden changes in the relation curves of the water levels and the hydraulic radiuses, and taking the sudden changes as demarcation points of the plain and the channel, and the plain and the plain. The method can quantificationally and automatically identify the main channel and the floodplain in the compound section, is simple and feasible, can be applied to quasi-two-dimensional flow and sediment mathematical modeling, and further can be used for evolution analysis on identifying the plain and the channel in the compound-section channel.

The invention discloses a river channel ecological restoration method based on a demand of aquatic organisms for hydrological conditions. The river channel ecological restoration method includes the steps that firstly, a river channel is investigated and surveyed, then the location of an ecological restoration area is determined, spur dikes are arranged, a deep pool is formed by dredging, flood plain is constructed, and a planting area of ecological restoration plants is determined. According to the demand of the aquatic organisms for hydrological and habitat conditions, river channel configuration is appropriately transformed, meanwhile suitable aquatic organisms are arranged in different habitat areas, so that a river channel ecosystem is effectively restored, the self purification capacity of the river channel is improved, the biodiversity is restored, and the function of the ecosystem is enhanced. Meanwhile, the river channel ecological restoration method can increase the stabilityof the river embankment without affecting the flood discharge capacity of the river channel, and has excellent effects in improving an ecological function, a landscape function and a social functionof a river.

A method for predicting the flow direction of water depth average flow in flood plain bend channel depending on the relative depth of the meandering channel of the floodplain, The geometry of bendingsection and the position of section to be predicted can be used to predict the average flow direction of water depth in any section between the bending section and the bending top section of bending channel, which not only has high prediction efficiency and accuracy, but also does not need to carry out velocity measurement or other exploration work, and has wide generality in this field. The present invention relates to a method for predicting the flow direction of bending section of bending channel.

The invention discloses an overbank flow floodplain and channel excess flow computing method. According to the method, a computing formula of floodplain and main channel excess flow is built, and the floodplain and channel excess flow ratio in the computing formula is closely related to the water depth ratio, the width ratio and the roughness factor ratio. In order to determine a mutual relation, a compound section transverse distribution flow mathematical model is adopted for computing the floodplain and channel excess flow under different conditions, the relational expression between the floodplain and channel excess flow ratio and the water depth ratio, the relational expression between the floodplain and channel excess flow ratio and the width ratio, and the relational expression between the floodplain and channel excess flow ratio and the roughness factor ratio are obtained through analysis, and finally the overbank flow floodplain and channel excess flow is comprehensively obtained through the computing method. According to the computing method, when fluvial cross section conditions are certain, the floodplain and channel excess flow can be rapidly obtained according to the forecast cross section flow, and a basis is provided for planning and utilization of floodplain and water resources.

The invention discloses a floodplain elevation determination method based on wavelet analysis, and the method comprises the steps: employing an S-K model for simulation to obtain the vertical flow velocity distribution of a river cross section, and calculating kinetic energy correction coefficients under different water levels; and carrying out discrete wavelet decomposition on the water level-kinetic energy correction coefficient function to obtain a high-frequency signal layer and coefficient absolute values of corresponding layers; analyzing the absolute value of the obtained highest frequency layer coefficient, determining the abrupt change position of the kinetic energy correction coefficient, and determining the elevation of the flood bank through comprehensive analysis. In the implementation process of the method, the defect that the beach-trough demarcation point is artificially judged in a traditional method is overcome, subjectivity is weak, the method is verified through tests, the calculation result is accurate, operability is high, and a more accurate mode is provided for obtaining the floodplain elevation of the compound cross-section river channel.

The invention discloses an artificial black-necked crane overwintering habitat and a building method of the artificial black-necked crane overwintering habitat. The artificial black-necked crane overwintering habitat comprises a night resting site artificially-built region, a natural enemy avoiding site artificially-built region and a foraging site artificially-built region which are located in awater area. The night resting site artificially-built region is located in an artificial island in water. The foraging site artificially-built region is located on the water bank and is close to the night resting site artificially built region. The natural enemy avoiding site artificially-built region is located in a water bay and located between the night resting site artificially-built region and the foraging site artificially-built region. The water area can be a flood plain, a wide shallow river and a reservoir. The artificial black-necked crane overwintering habitat provides an artificially built natural habitat system suitable for the black-necked cranes to live through the whole overwintering period and provides a good living and multiplying site for the rare bird, black-necked crane, and other birds and provides more broad space for smooth overwintering of the black-necked cranes. Besides, the artificial black-necked crane overwintering habitat is simple in structure, low in building cost and beneficial for improvement of the ecological environment.

The invention discloses a method for artificially promoting a populus euphratica forest to recover into a forest by simulating a populus euphratica floodplain habitat, and belongs to the technical field of populus euphratica forest recovery into the forest. By means of the method, according to the ideas of depending on nature and recovering the nature, in abandoned cultivated land, returned cultivated land and other areas with populus euphratica distribution and few populus euphratica seeding, less water resources are used for simulating the floodplain habitat of populus euphratica seed germination; the seeding amount is increased through manual reseeding, the germination number of populus euphratica seeds in the areas can be remarkably increased, and then the seedling distribution numberand uniformity are improved; and populus euphratica habitat conditions are guaranteed through manual management measures in the later period, populus euphratica seedling young forests grow up as soonas possible, and the natural recovery number of the populus euphratica in the areas is effectively improved. By means of the method, the natural recovery capacity of the populus euphratica in the abandoned cultivated land and the returned cultivated land can be effectively improved, and the method is suitable for recovering the populus euphratica into the forest in arid desert areas, especially abandoned cultivated land and returned cultivated land seedling regeneration young forest areas.

The invention discloses a floodplain average elevation determination method based on sediment carrying force change, which adopts a formula to calculate and obtain flow velocity distribution of a transverse section of a compound section under different water level conditions, and calculates and obtains a water level sediment carrying capacity relation curve according to a suspended load water flowsediment carrying capacity formula. In order to judge the change rate of the sediment carrying force along with the water level, the relation between the slope of the sediment carrying force curve and the water level is further established, the minimum extreme point of the slope on the relation curve is captured, and the elevation corresponding to the extreme point is the representative elevationof the flood bank. According to the method, the floodplain elevation can be determined without manually judging the beach-trough boundary point, and the defect that the beach-trough boundary point needs to be manually judged in advance in a traditional method is overcome.

The artificial wetland system mainly comprises the following contents: 1) an artificial wetland is set to be in a two-stage step type, the first-stage step is an emergent aquatic plant planting area, and the second-stage step is a shrub and grass mixed planting area; (2) arranging a sand setting device on the outer side of a first-stage step of the constructed wetland; (3) spraying an anti-erosion planting substrate layer with the thickness of 3-5cm on the surface of the constructed wetland area; 4) respectively selecting plants in the emergent aquatic plant planting area and the arbor-shrub-grass mixed planting area according to local climate environment conditions; and 5) mixing seeds into the matrix, and spraying the mixture on the surface of the matrix layer in the corresponding area to form a seed layer with the thickness of 2cm. The artificial wetland effectively solves the problems that sediment accumulation is easily caused and plants are difficult to preserve when an artificial wetland technology is applied to the river and the flood plains, reduces the exposed area of the river and the flood plains in the dry season, reduces a sand wind source, prevents sediment accumulation from further expanding the river and the flood plains, and realizes ecological restoration.

The invention relates to a device and a method for preventing floods in the event of a river carrying floodwater. At least one mainline is provided which leads from the region of the floodplain to a collection basin and has one or more pumps in order to pump part of the floodwater through said mainline to the aforementioned collection basin in the event of floodwater, the base of said collection basin lying at a higher level than the riverbed such that electric energy is converted into potential energy of the water during the operation of the at least one pump. According to the method, the electric energy for operating the at least one pump is drawn from a local energy store or is converted in situ from a third energy form which differs from electric energy and hydropower. This is achieved using a device for drawing the electric energy for operating the at least one pump from a local energy store or converting the electric energy in situ from a third energy form which differs from electric energy and hydropower.

The invention provides an ecological restoration structure (10) for a floodplain. The structure comprises a wooden frame, a stone material (18) and branches (20); the wooden frame comprises a top plate (14) and a bottom plate (16) which are opposite to each other; the stone material is arranged between the top plate (14) and the bottom plate (16); the branches (20) are arranged on the top surfaceof the top plate (14). The invention aims at providing the ecological restoration structure which can protect a floodplain ecosystem and improve the water quality.

The invention discloses a method of constructing a lateral seepage-water spreading system in an under-dam area of a floodplain type river. The lateral seepage-water spreading system comprises a siphonwater taking system, river beach lateral seepage systems and river beach water spreading systems. The method comprises the following steps: construction of the siphon water taking system: siphoning an upstream water body of a retaining dam to flood land at two banks under the dam through a siphoning device; construction of the river beach lateral seepage systems: excavating lateral seepage ditches in the flood land, and enabling the lateral seepage ditches to be parallel to a water flow direction and to extend from river beach slopes to a water surface; and construction of the river beach water spreading systems: placing pebbles in the interval areas of lateral seepage ditches, and planting emergent aquatic plants and small trees and shrubs in the interval areas, wherein the river beach lateral seepage systems and the river beach water spreading systems are arranged at intervals and extend to the normal water level area of the riverway from the uppermost stage of the under-dam flood land. According to the method of constructing the lateral seepage-water spreading system in the under-dam area of the floodplain type river, investment is saved, technological operation is simple, andthe system has good applicability to multi-gate dam type riverways in northern areas, effectively purifies riverway water and intercepts non-point source pollution in shore zones and has certain application prospects.