Water resource shortage area water circulation utilization system and its construction method

Abstract

The present disclosure relates to a water resource shortage area water recycling system and a construction method thereof. The water resource shortage area water recycling system comprises a silt dam, a water storage pool, a fish pond, a fruit and pasture complex garden, a first flow guide pipe and a second flow guide pipe. The silt dam is built in a river channel. The water storage pool is located upstream of the silt dam. The fish pond is located downstream of the water storage pool. One end of the first flow guide pipe is in communication with the water storage pool, and the other end of the first flow guide pipe is in communication with the fish pond. The fruit and pasture complex garden is located downstream of the fish pond. One end of the second flow guide pipe is in communication with the fish pond, and the other end of the second flow guide pipe is located in the fruit and pasture complex garden. In the rainy season, the silt dam built in the river channel can store the rainwater collected in the river channel, and the rainwater is stored in the water storage pool located upstream of the silt dam. In the dry season, the stored rainwater in the water storage pool can be guided to the fish pond through the first flow guide pipe to realize water replenishment and storage of the fish pond.

Description

Technical Field

[0001] This disclosure relates to the field of water resource recycling technology, specifically to a system for water recycling in water-scarce areas and its construction method. Background Technology

[0002] Arid regions typically receive between 200 and 500 mm of precipitation annually, with large diurnal and annual temperature ranges. Evaporation far exceeds precipitation, and the region is characterized by frequent sandstorms, low cloud cover, and intense sunshine. Vegetation in arid regions is dominated by xerophytic grasses and shrubs, and water scarcity is the primary factor limiting plant growth and agricultural development.

[0003] Arid regions generally face the following development and ecological problems: First, agriculture requires a large amount of water, but the supply is insufficient, resulting in low farmer incomes. Arid regions experience low rainfall and high evaporation, leading to severe water shortages and hindering agricultural development in mountainous and hilly areas. With increasing population and expanding cultivated land, water demand is growing daily, leading to severe over-extraction of groundwater. Agricultural development is largely dependent on rainfall, making ecological and sustainable agricultural development extremely difficult. Second, frequent seasonal floods and severe soil erosion occur. Rainfall in these regions is scarce and unevenly distributed throughout the year, with 70%–80% of the annual rainfall occurring from June to September, often in the form of torrential rains. These concentrated heavy rainfalls cause frequent seasonal floods, severe soil erosion, and other natural disasters.

[0004] Arid regions suffer from water scarcity due to scarce rainfall, which restricts agricultural development. Simultaneously, concentrated rainfall causes severe surface erosion, leading to soil erosion and significant waste of water and soil resources. Based on these practical livelihood and ecological problems in arid regions, this innovative approach was developed to construct a rational system for collecting, storing, and utilizing rainwater resources in arid areas. This system drives a circular economy in agriculture and is of great significance for economic development, soil and water conservation, and ecological environment improvement in arid regions. Summary of the Invention

[0005] The purpose of this disclosure is to provide a system for water recycling in water-scarce areas and a method for its construction, in order to solve the technical problem of insufficient multi-level water resource utilization in related technologies in arid and low-rainfall areas.

[0006] To achieve the above objectives, a first aspect of this disclosure provides a system for water recycling in water-scarce areas, comprising: Silt-retention dams, which are constructed within river channels; A reservoir, located upstream of the silt-retaining dam; A fishpond, located downstream of the reservoir; The first diversion pipe has one end connected to the water storage tank and the other end connected to the fishpond. A forest, fruit and pasture replanting garden, wherein the forest, fruit and pasture replanting garden is located downstream of the fishpond; The second diversion pipe has one end connected to the fishpond and the other end located within the orchard and pasture replanting garden.

[0007] Optionally, the water-facing side of the silt-retaining dam is made of a steel mesh cage filled with boulders and planting soil.

[0008] Optionally, the water recycling system in the water-scarce area further includes a filtration device, which is installed above the reservoir and is used to filter impurities from rainwater.

[0009] Optionally, the filtration device includes a filter layer and an anti-clogging layer, the anti-clogging layer being disposed above the filter layer, the filter layer being made of permeable silica sand material, and the anti-clogging layer being composed of a coarse sand layer and / or a gravel layer.

[0010] Optionally, the water recycling system in the water-scarce area further includes a vent pipe, the bottom of which extends below the filter device and above the water surface of the reservoir, and the top of which is connected to the outside atmosphere.

[0011] Optionally, the top of the vent pipe is at a horizontal height higher than the highest point of the silt-retaining dam.

[0012] Optionally, the water storage tank includes multiple independent water storage units, and two adjacent water storage units are connected by a connecting hole.

[0013] Optionally, each pair of adjacent water storage units is connected by at least two connecting holes, and a plurality of connecting holes formed on the two adjacent water storage units are spaced apart in the vertical direction.

[0014] Optionally, the water recycling system in the water-scarce area also includes a livestock farm, which is located adjacent to the forest, fruit and pasture replanting garden.

[0015] A second aspect of this disclosure provides a method for constructing a water recycling system in the aforementioned water-scarce areas, the method comprising: Construct silt-retaining dams in the middle and upper reaches of the river; Excavation was carried out upstream of the silt-retaining dam to form a reservoir; A fishpond is excavated downstream of the reservoir, and a first guide pipe is installed in the reservoir and connected to the interior of the fishpond. A forestry and fruit orchard and pasture replanting garden is planted downstream of the fishpond, and a second diversion pipe is installed between the fishpond and the forestry and fruit orchard and pasture replanting garden, so that the water in the fishpond can be diverted to the forestry and fruit orchard and pasture replanting garden through the second diversion pipe.

[0016] Through the above technical solution, during the rainy season, the silt-retaining dam built in the river channel can intercept and store rainwater that accumulates in the river channel, so that the rainwater flows into the reservoir located upstream of the silt-retaining dam, thereby realizing the storage of rainwater during the rainy season. Since the fishpond is located downstream of the reservoir, when the dry season arrives, the rainwater stored in the reservoir can be diverted to the fishpond through the first diversion pipe, thereby realizing the replenishment and storage of water in the fishpond.

[0017] Furthermore, the aforementioned orchards and pasture replanting gardens are located downstream of the fishponds. The nitrogen- and phosphorus-rich aquaculture water in the fishponds can flow downstream under gravity to provide irrigation water for the orchards and pasture replanting gardens, ensuring the yield of orchards and pastures. At the same time, the bottom mud (pond mud) of the fishponds accumulates a lot of decaying aquatic plants, fish and shrimp, dead branches, fallen leaves, and waterfowl droppings, including some small animal droppings and carcasses. In addition, ponds are generally located in relatively low-lying areas, with fertile water and mud flowing down from all sides. Pond mud is a very good fertilizer. In other words, pond mud can provide organic fertilizer for the orchards and pasture replanting gardens, thereby improving the soil, enhancing fertility, and ensuring the efficient production of orchards and pastures.

[0018] In other words, it not only enables the effective collection and utilization of rainwater resources in arid areas, but also promotes the closed loop of the triangular industrial circle of agricultural economy, and can effectively improve and promote the efficient collection and utilization of water resources in water-scarce areas, truly maximizing resource utilization and economic benefits.

[0019] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a top view schematic diagram of a water recycling system in water-scarce areas provided by an exemplary embodiment of this disclosure; Figure 2 This is a partial front view schematic diagram of a water recycling system in water-scarce areas provided by an exemplary embodiment of this disclosure; Figure 3 yes Figure 2 An enlarged view of part A; Figure 4This is a flowchart illustrating a method for constructing a water recycling system in water-scarce areas according to an exemplary embodiment of this disclosure. Figure 5 This is a two-dimensional coordinate diagram illustrating the impact of fishpond area on total average annual profit under different planned operating years using the water recycling system provided in this disclosure in water-scarce areas.

[0021] Explanation of reference numerals in the attached figures 10-Silt-retaining dam; 20-Reservoir; 21-Water storage unit; 210-Connecting hole; 30-Fishpond; 40-First diversion pipe; 41-Control valve; 50-Forestry and pasture replanting garden; 60-Second diversion pipe; 70-Filter device; 71-Filter layer; 72-Anti-clogging layer; 80-Ventilation pipe; 90-Aquaculture farm; 100-River channel. Detailed Implementation

[0022] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0023] In this disclosure, the term "vertical direction" can be understood as shown in the figures. It should also be noted that terms such as "first" and "second" are used to distinguish one element from another and do not indicate sequence or importance. Furthermore, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same elements.

[0024] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms “set up,” “connect,” “link,” and “install” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection.

[0025] The connection can be direct or indirect, via an intermediate medium. Those skilled in the art can understand the specific meaning of the terms used in this disclosure based on the specific circumstances.

[0026] refer to Figures 1 to 5 As shown, the first aspect of this disclosure provides a water recycling system for water-scarce areas, including a silt-retention dam 10, a reservoir 20, a fishpond 30, a forest-fruit-pasture replanting garden 50, a first diversion pipe 40, and a second diversion pipe 60. The silt-retention dam 10 is constructed within a river channel 100. The reservoir 20 is located upstream of the silt-retention dam 10, and the fishpond 30 is located downstream of the reservoir 20. One end of the first diversion pipe 40 is connected to the reservoir 20, and the other end of the first diversion pipe 40 is connected to the fishpond 30. The forest-fruit-pasture replanting garden 50 is located downstream of the fishpond 30. One end of the second diversion pipe 60 is connected to the fishpond 30, and the other end of the second diversion pipe 60 is located within the forest-fruit-pasture replanting garden 50.

[0027] Through the above technical solution, during the rainy season, the silt-retaining dam 10 built in the river channel 100 can intercept and store the rainwater accumulated in the river channel 100, so that the rainwater flows into the reservoir 20 located upstream of the silt-retaining dam 10, thereby realizing the storage of rainwater during the rainy season. Since the fishpond 30 is located downstream of the reservoir 20, when the dry season arrives, the rainwater stored in the reservoir 20 can be diverted to the fishpond 30 through the first diversion pipe 40, thereby realizing the replenishment and storage of water in the fishpond 30.

[0028] In addition, the aforementioned fruit and pasture replanting garden 50 is located downstream of the fishpond 30. The aquaculture water in the fishpond 30, which is rich in nitrogen and phosphorus nutrients, can flow downstream by gravity to provide irrigation water for the fruit and pasture replanting garden 50, thus ensuring the yield of fruit and pasture.

[0029] Meanwhile, the bottom mud (pond mud) of fishpond 30 contains a lot of rotten aquatic plants, fish and shrimp, dead branches, fallen leaves, and waterfowl droppings, as well as some small animal droppings and carcasses. In addition, ponds are generally located in relatively low-lying areas, with fertile water and mud flowing down from all sides. Pond mud is a very good fertilizer. In other words, pond mud can provide organic fertilizer for forest, fruit and pasture replanting garden 50, thereby improving the soil, enhancing fertility, and ensuring the efficient production of forest, fruit and pasture.

[0030] In other words, it not only enables the effective collection and utilization of rainwater resources in arid areas, but also promotes the closed loop of the triangular industrial circle of agricultural economy, and can effectively improve and promote the efficient collection and utilization of water resources in water-scarce areas, truly maximizing resource utilization and economic benefits.

[0031] Regarding the aforementioned construction of a reservoir 20 upstream of the flood-blocking area formed by the silt-retaining dam 10, the distance between the reservoir 20 and the silt-retaining dam 10 should be greater than 10m, thereby reducing the accumulation and coverage of silt.

[0032] In one exemplary embodiment provided in this disclosure, the fish species suitable for local aquaculture are grass carp, common carp, and sturgeon, with an annual yield of approximately 1300 kg / mu. The local live fish price is 18.5 yuan / kg, resulting in a gross profit of 24440 yuan / (mu•year). The annual water replenishment quota is 1100 m³. 3 The indirect feed for fish, sheep manure, requires approximately 500 kg / (mu•year).

[0033] For the aforementioned orchard and forage compounding plantation 50, in one exemplary embodiment provided in this disclosure, the suitable fruit tree with excellent local yield and benefits is apple, with an annual yield of 7,000 jin / mu. The local apple price is 2 yuan / jin, and the gross profit is 14,000 yuan / (mu•year). The annual irrigation water quota is 200 cubic meters, which is the larger of the forage and fruit trees.3 / mu. According to the inventor's research, a 50-year integrated orchard of fruit trees and forage grasses requires 1500 kg / (mu•year) of fermented organic fertilizer. Suitable forage grasses for raising livestock and fish can be selected such as Lespedeza and alfalfa. By planting fruit trees and forage grasses in multiple layers and nested arrangements, dual benefits can be achieved.

[0034] To enhance the stability and robustness of the aforementioned silt-retaining dam 10, in one exemplary embodiment provided in this disclosure, the water-facing side of the silt-retaining dam 10 can be constructed from a reinforced wire mesh cage filled with boulders and planting soil. This allows for the formation of an impact-resistant green wall by sowing plant seeds into the planting soil, thereby reducing the impact of floods on the dam body and extending the service life of the silt-retaining dam 10.

[0035] Optionally, such as Figure 2 , Figure 3 As shown, the water recycling system in water-scarce areas may also include a filtration device 70, which is installed above the reservoir 20. The filtration device 70 is used to filter impurities in rainwater. By installing the filtration device 70, floating impurities (such as branches and leaves) in the rainwater can be filtered out, thereby ensuring the cleanliness of the rainwater flowing into the reservoir 20.

[0036] This disclosure does not limit the specific filtration method and structure of the above-mentioned filter device 70, for example, such as Figure 2 , Figure 3 As shown, in one embodiment of this disclosure, the filtration device 70 can be a filter screen covering the water storage tank 20. Alternatively, in another exemplary embodiment of this disclosure, the filtration device 70 includes a filter layer 71 and an anti-clogging layer 72, with the anti-clogging layer 72 disposed above the filter layer 71. The filter layer 71 is made of permeable silica sand material, and the anti-clogging layer 72 is composed of a coarse sand layer and / or a gravel layer. The size and shape of the silica sand particles can block solid particles and suspended matter in the water, thereby achieving the effect of physical filtration. In addition, the porous structure and high specific surface area of ​​silica sand make it a good adsorbent, capable of adsorbing harmful substances such as organic matter and heavy metal ions in the water.

[0037] To meet the requirements for rainwater filtration, the permeability of the aforementioned silica sand should be no less than 1 m / d.

[0038] During the rainy season, rainfall is abundant, and the water supply in fishpond 30 is plentiful. Therefore, there is no need for water storage tank 20 to drain water into fishpond 30. Conversely, during the dry season, rainfall is less, and the water level in fishpond 30 decreases. To facilitate the regulation of water volume between water storage tank 20 and fishpond 30, in this disclosure, optionally, as follows: Figure 1As shown, a control valve 41 is installed on the first diversion pipe 40, which is used to control the opening and closing of the first diversion pipe 40. In this way, during the rainy season, the control valve 41 can be switched to the closed state, at which time the first diversion pipe 40 is in the open state. When the dry season comes, the control valve 41 is switched to the open state, and under the action of gravity, the water source in the reservoir 20 located upstream of the fishpond 30 can automatically flow into the fishpond 30 through the first diversion pipe 40 to replenish the fishpond 30.

[0039] Similarly, such as Figure 1 As shown, the control valve 41 mentioned above can also be installed on the second diversion pipe 60 to supplement the water source for the forest, fruit and pasture replanting garden 50 during the dry season.

[0040] In addition, the first diversion pipe 40 can be a porous conduit. The porous part of the first diversion pipe 40 is located inside the water storage tank, and the non-porous part is located outside the water storage tank. It can supply the fishpond 30 downstream and achieve free outflow without power consumption.

[0041] Alternatively, the water recycling system in the aforementioned water-scarce areas may also include a controller and a pressure sensor. The pressure sensor can be installed in the second guide pipe 60 and located within the fishpond 30. The controller is connected to both the pressure sensor and the control valve 41, and can control the opening and closing of the control valve 41 based on the pressure data measured by the pressure sensor. Specifically, as the water level in the fishpond 30 decreases, the pressure data detected by the pressure sensor gradually decreases until it reaches a preset minimum rated pressure value. At this point, the controller receives a command and can control the control valve 41 to open, thereby allowing water from the reservoir 20 located upstream of the fishpond 30 to flow into the fishpond 30.

[0042] As water continuously flows into the fishpond 30, the water level in the fishpond 30 rises continuously, and the pressure data measured by the pressure sensor increases continuously until the pressure data reaches the preset maximum rated pressure value. At this time, the controller receives another instruction and can control the control valve 41 to close. At this time, the water in the reservoir 20 can no longer flow into the fishpond 30, so as to avoid the problem of water wasting due to excessive water flowing into the fishpond 30 and overflowing from the fishpond 30.

[0043] Optionally, such as Figure 2 , Figure 3 As shown, a water recycling system in water-scarce areas may also include a vent pipe 80. The bottom end of the vent pipe 80 extends below the filter device 70 and is located above the water surface of the reservoir 20, while the top end of the vent pipe 80 is connected to the outside atmosphere. On the one hand, providing vents can promote water flow and circulation, increase the contact area between water and air, and improve the oxygen content and water quality of the water.

[0044] On the other hand, vents can also help control water quality and remove harmful gases and pollutants from the water, such as ammonia and hydrogen sulfide.

[0045] Optionally, such as Figure 2 As shown, the top of the vent pipe 80 is horizontally higher than the highest point of the silt-retaining dam 10. The top of the vent is higher than the top of the dam 10 (which can prevent direct flooding), and rainwater resources can be forced to seep into the reservoir 20 under the action of gravity.

[0046] In this disclosure, in order to avoid or reduce the downward seepage of water in the reservoir 20, the reservoir can be constructed of a breathable and impermeable sand material to ensure that water resources do not leak out.

[0047] In addition, such as Figures 1 to 3 As shown, the water storage tank 20 may include multiple independent water storage units 21, and two adjacent water storage units 21 are connected through a connecting hole 210. The multiple water storage units 21 are arranged in multiple rows and columns to store water together. Furthermore, because the multiple water storage units 21 are arranged independently, even if one water storage unit leaks or is damaged, it will not affect the water storage of other water storage units 21.

[0048] Optionally, such as Figure 2 , Figure 3 As shown, each pair of adjacent water storage units 21 is connected by at least two connecting holes 210, and multiple connecting holes 210 formed on adjacent pairs of water storage units 21 are spaced apart in the vertical direction. In this way, multiple connecting holes 210 can connect multiple water storage units 21, thereby ensuring the consistency of water level in multiple water storage units 21.

[0049] Furthermore, by providing multiple connecting holes 210 spaced apart in the vertical direction on two adjacent water storage units 21, the fault tolerance rate of water flow in the adjacent water storage units 21 can be improved. Even if one connecting hole 210 is blocked, the other connecting holes 210 can still play a guiding role on their own.

[0050] In this disclosure, in order to prevent the silt deposited at the bottom of the water storage unit 21 from clogging the aforementioned connecting hole 210, the connecting hole 210 can be formed in the middle of the water storage unit 21. In this way, silt and other impurities in the water storage unit 21 can settle to the bottom of the water storage unit 21 under the action of gravity. The fact that the connecting hole 210 is formed in the middle of the water storage unit 21 can prevent silt and other impurities from covering or blocking the connecting hole 210 and affecting the normal flow of water.

[0051] Alternatively, in order to maximize the flow of water from the water storage unit 21 into the downstream fishpond 30 and increase the water outflow rate of the water storage unit 21, such as... Figure 2 , Figure 3 As shown, the aforementioned connecting hole 210 can also be located at the bottom of the water storage unit 21. To avoid interference from silt and other impurities settling at the bottom of the water storage unit 21, a stirring device can be installed around the connecting hole 210 located at the bottom of the water storage unit 21. In this way, during the drainage process of the water storage unit 21, the stirring device rotates, thereby agitating the water flow around the drainage hole, so that the silt deposited or attached around the connecting hole 210 can be broken up, that is, changed from large-diameter lumps to small-diameter particles (since the larger impurities have been filtered by the aforementioned filter device 70, the impurities accumulated at the bottom of the water storage unit 21 are all relatively small-diameter impurities), thus making it easier for the water at the bottom of the water storage unit 21 to be smoothly discharged through the connecting hole 210.

[0052] Furthermore, such as Figure 1 As shown, the water recycling system in water-scarce areas may also include a livestock farm 90, which is adjacent to a forestry, fruit, and pasture replanting garden 50. In an exemplary embodiment provided in this disclosure, the livestock farm 90 can be a sheep farm 90. Since the livestock farm 90 is adjacent to the forestry, fruit, and pasture replanting garden 50, the pasture can be used as silage for the sheep. After fermentation and sterilization, the sheep manure can be used as organic fertilizer to replenish the forestry, fruit, and pasture replanting garden 50, enhancing soil fertility and producing organic fruit.

[0053] Furthermore, sheep manure can be used to provide nutrients for the fish in fishpond 30. Specifically, sheep manure from sheep farm 90 is collected, fermented and sterilized with appropriate bacterial solution, and then added in a suitable amount to fishpond 30 to enrich the aquatic environment and promote the reproduction of microorganisms for the fish to eat. In addition, cleaning the banks of fishpond 30 can provide drinking water for the sheep.

[0054] Regarding the water recycling system in the aforementioned water-scarce areas, which may also include the implementation of a livestock farm 90, in one exemplary embodiment provided in this disclosure, an average sheep can gain 100 jin (50 kg) per year, the local sheep price is 14.5 yuan / jin, the gross profit is 1450 yuan / sheep / year, and each sheep requires 9L of water per day, totaling 3.3m³. 3 / (only•year); Each sheep produces about 2 kg of manure per day. Assuming an annual collection rate of 50%, each sheep produces 365 kg of manure per year.

[0055] In addition, it is important to note that to ensure the smooth operation of a water recycling system in water-scarce areas, it is necessary to quantitatively calculate the balance of economic benefits for each land use area. Using a one-acre orchard (50 acres) as a basic equivalent, this study analyzes the optimal size of a fishpond (30 acres), the scale of sheep farming, and the water storage capacity to maximize the overall annual system profit.

[0056] Research has determined that one acre of pasture in this area is suitable for raising 10 meat sheep. Fishponds with a capacity of 30 have a large water consumption. In order to control water resource consumption, the area of ​​fishponds with a capacity of 30 should not exceed the area of ​​a multi-cropping orchard of forest, fruit and pasture. The production of sheep manure should be no less than the usage requirements of 30 for fish ponds and 50 for orchards and pasture replanting gardens; Fishpond 30 yields high returns, but consumes a lot of water, resulting in high input costs. Therefore, it is necessary to rationally analyze how large a fishpond 30 area should be configured for one acre of forest, fruit and pasture compounding orchard 50 to achieve the optimal results. To address the above issues, the following economic benefit model is proposed: Objective: Max{[(P1×A1+P2×A2+P3×A3)×N-(W1+W2+W3)×P4] / N}; Constraint: A2 = A3 / 10; A1≤A2; F3≥F1+F2; Among them, P1, P2, and P3 are the gross profits (yuan / unit) of fish ponds (30), forest and fruit and pasture replanting gardens (50), and sheep farms (90). A1, A2, and A3 represent the number of sheep (in units) in a fishpond of 30 mu, a forest, fruit and pasture replanting garden of 50 mu, and a sheep farm of 90 mu, respectively. W1, W2, and W3 represent the water requirements (m3) for a fishpond of 30, a forest, fruit and pasture replanting garden of 50, and a sheep farm of 90, respectively. P4 represents the unit cost for constructing the water storage tank (yuan / m³). 3 ); N represents the planned operating period (in years); F1 and F2 represent the manure requirements (kg / year) for a fishpond of 30 and a forest, fruit and pasture replanting garden of 50, respectively, while F3 represents the manure production (kg / year) for a sheep farm of 90.

[0057] Analysis of the impact of a 30-acre fishpond on the average annual profit under different planned operating periods reveals the following: Figure 5 As shown, when the planned operating period is no more than 5 years, the smaller the area of ​​the supporting fishpond 30, the higher the average annual profit. When the planned operating period exceeds 5 years, the larger the area of ​​the supporting fishpond (30 mu), the higher the average annual profit. Given that the service life of this rainwater utilization system can reach 10-15 years, we conservatively set the planned operating period at 10 years. To maximize the average annual total profit, the supporting fishpond area should be 1 mu (approximately 0.16 acres).

[0058] Based on the above analysis, it can be determined that when the planned operating period is 10 years, the optimal scale is 50 mu of forest, fruit and pasture replanting garden, 30 mu of fish pond, and 90 mu of 10 sheep farm, which can maximize the average annual total profit.

[0059] Based on the determined scale of the forestry, grassland, animal husbandry, and fishery economic cycle, the following can be calculated: Annual water consumption: 200m³ 3 +33m 3 +1100m 3 =1333m 3 ; Assuming a water replenishment frequency of 4 times per year and a guarantee factor of 2, the reservoir size is 1333m³. 3 / 4×2=667m 3 ; The construction cost is 667m 3 ×250 yuan / m 3 =166,750 yuan; Total profit for the planned operating period of the forestry, grassland, animal husbandry and fishery industry: (24,440 yuan + 14,000 yuan + 14,500 yuan) × 10 - 166,750 yuan = 362,650 yuan; Average annual profit of forestry, grassland, animal husbandry and fishery industry: 362,650 yuan ÷ 10 years = 36,265 yuan / year; That is, when the planned operating period is 10 years, a construction of 667m² will be carried out. 3 The stormwater utilization system cost 166,750 yuan and generated 362,650 yuan in economic benefits over 10 years of operation, achieving an average annual profit of 36,265 yuan.

[0060] The second aspect of this disclosure provides a method for constructing a water recycling system in the aforementioned water-scarce areas, the method comprising: S101. Construct a silt-retaining dam 10 in the middle and upper reaches of the river channel 100. When constructing the silt-retaining dam 10, a steel mesh cage can be installed on the water-facing side of the silt-retaining dam 10, and the steel mesh cage can be filled with boulders and planting soil. Then, by sowing green plant seeds in the planting soil, an anti-impact green plant soil-stabilizing wall belt can be formed, thereby reducing the impact of floods on the dam body and extending the service life of the silt-retaining dam 10.

[0061] S102. Excavate earthwork upstream of the silt-retention dam 10 to form a reservoir 20. The reservoir 20 may include multiple independent water storage units 21, with adjacent water storage units 21 connected by a connecting hole 210. The multiple water storage units 21 are arranged in multiple rows and columns to store water together. Furthermore, because the multiple water storage units 21 are arranged independently, even if one water storage unit leaks or is damaged, it will not affect the water storage of other water storage units 21.

[0062] S103. A fishpond 30 is excavated downstream of the reservoir 20, and a first diversion pipe 40 is installed inside the reservoir 20 and connected to the interior of the fishpond 30. When the dry season arrives, rainwater stored in the reservoir 20 can be diverted to the fishpond 30 through the first diversion pipe 40, thereby realizing the water replenishment and storage operation of the fishpond 30.

[0063] S104. Plant a forest, fruit and pasture replanting garden 50 downstream of the fishpond 30, and set up a second diversion pipe 60 between the fishpond 30 and the forest, fruit and pasture replanting garden 50, so that the water in the fishpond 30 can be diverted to the forest, fruit and pasture replanting garden 50 through the second diversion pipe 60.

[0064] Through the above technical solution, during the rainy season, the silt-retaining dam 10 built in the river channel 100 can intercept and store the rainwater accumulated in the river channel 100, so that the rainwater flows into the reservoir 20 located upstream of the silt-retaining dam 10, thereby realizing the storage of rainwater during the rainy season. Since the fishpond 30 is located downstream of the reservoir 20, when the dry season arrives, the rainwater stored in the reservoir 20 can be diverted to the fishpond 30 through the first diversion pipe 40, thereby realizing the replenishment and storage of water in the fishpond 30.

[0065] In addition, the aforementioned fruit and pasture replanting garden 50 is located downstream of the fishpond 30. The aquaculture water in the fishpond 30, which is rich in nitrogen and phosphorus nutrients, can flow downstream by gravity to provide irrigation water for the fruit and pasture replanting garden 50, thus ensuring the yield of fruit and pasture.

[0066] Meanwhile, the bottom mud (pond mud) of fishpond 30 contains a lot of rotten aquatic plants, fish and shrimp, dead branches, fallen leaves, and waterfowl droppings, as well as some small animal droppings and carcasses. In addition, ponds are generally located in relatively low-lying areas, with fertile water and mud flowing down from all sides. Pond mud is a very good fertilizer and can be used to provide organic fertilizer for the forest, fruit and pasture replanting garden 50, improve the soil, enhance fertility, and ensure the efficient production of forest, fruit and pasture.

[0067] In other words, this disclosure not only enables the effective collection and utilization of rainwater resources in arid areas, but also promotes the closed loop of the triangular industrial circle of agricultural economy, and can effectively improve and promote the efficient collection and utilization of water resources in water-scarce areas, truly maximizing resource utilization and economic benefits.

[0068] Furthermore, the above method may also include constructing livestock farms 90 adjacent to the forest-fruit-pasture replanting garden 50, such as sheep farms 90 and cattle farms 90. In this way, on the one hand, since the livestock farms 90 are set up adjacent to the forest-fruit-pasture replanting garden 50, the pasture can be used as silage to feed the sheep. On the other hand, the manure of the sheep and cattle, after fermentation and sterilization, can be used as organic fertilizer to replenish the forest-fruit-pasture replanting garden 50, enhance soil fertility, and produce organic fruits.

[0069] It should be noted that this disclosure does not limit the specific construction steps for the above-mentioned water recycling system in water-scarce areas. For example, a silt-retention dam 10 can be built first, or a fishpond 30 or a reservoir 20 can be excavated first.

[0070] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0071] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0072] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A system for water recycling in water-scarce areas, characterized in that, include: Silt-retention dams, which are constructed within river channels; A reservoir, located upstream of the silt-retaining dam; A fishpond, located downstream of the reservoir; The first diversion pipe has one end connected to the water storage tank and the other end connected to the fishpond. A forest, fruit and pasture replanting garden, wherein the forest, fruit and pasture replanting garden is located downstream of the fishpond; The second diversion pipe has one end connected to the fishpond and the other end located within the orchard and pasture replanting garden.

2. The water recycling system for water-scarce areas according to claim 1, characterized in that, The water-facing side of the silt-retaining dam is made of a steel mesh cage filled with boulders and planting soil.

3. The water recycling system for water-scarce areas according to claim 1, characterized in that, The water recycling system in the water-scarce area also includes a filtration device, which is installed above the reservoir and is used to filter impurities from rainwater.

4. The water recycling system for water-scarce areas according to claim 3, characterized in that, The filtration device includes a filter layer and an anti-clogging layer. The anti-clogging layer is disposed above the filter layer. The filter layer is made of permeable silica sand material, and the anti-clogging layer is composed of a coarse sand layer and / or a gravel layer.

5. The water recycling system for water-scarce areas according to claim 3, characterized in that, The water recycling system in the water-scarce area also includes a vent pipe, the bottom of which extends below the filter device and above the water surface of the reservoir, and the top of which is connected to the outside atmosphere.

6. The water recycling system for water-scarce areas according to claim 5, characterized in that, The top of the vent pipe is at a higher horizontal position than the highest point of the silt-retaining dam.

7. The water recycling system for water-scarce areas according to claim 1, characterized in that, The water storage tank includes multiple independent water storage units, and two adjacent water storage units are connected by a connecting hole.

8. The water recycling system for water-scarce areas according to claim 7, characterized in that, Each pair of adjacent water storage units is connected by at least two connecting holes, and a plurality of connecting holes formed on the two adjacent water storage units are spaced apart in the vertical direction.

9. The water recycling system for water-scarce areas according to claim 1, characterized in that, The water recycling system in the water-scarce area also includes a livestock farm, which is located adjacent to the forest, fruit and pasture replanting garden.

10. A method for constructing a water recycling system in water-scarce areas according to any one of claims 1-9, characterized in that, The method includes: Construct silt-retaining dams in the middle and upper reaches of the river; Excavation was carried out upstream of the silt-retaining dam to form a reservoir; A fishpond is excavated downstream of the reservoir, and a first guide pipe is installed inside the reservoir, connecting the first guide pipe to the interior of the fishpond. A forestry and fruit orchard and pasture replanting garden is planted downstream of the fishpond, and a second diversion pipe is installed between the fishpond and the forestry and fruit orchard and pasture replanting garden, so that the water in the fishpond can be diverted to the forestry and fruit orchard and pasture replanting garden through the second diversion pipe.

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