CN107466665B - Sand land water and soil conservation system and method - Google Patents
Sand land water and soil conservation system and method Download PDFInfo
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- CN107466665B CN107466665B CN201710877360.3A CN201710877360A CN107466665B CN 107466665 B CN107466665 B CN 107466665B CN 201710877360 A CN201710877360 A CN 201710877360A CN 107466665 B CN107466665 B CN 107466665B
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G25/00—Watering gardens, fields, sports grounds or the like
- A01G25/06—Watering arrangements making use of perforated pipe-lines located in the soil
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
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Abstract
The invention relates to a sand water and soil conservation system and a method, comprising the following steps: the water storage tank that sets up on the higher domatic of slope top or relief, the water storage tank connect the trunk pipe, the trunk pipe lay along domatic downward sloping, the trunk pipe on set up lateral pipe or breakwater of a plurality of level differences, lateral pipe or breakwater lay along domatic downward sloping, lateral pipe or breakwater on arrange a plurality of delivery ports, correspond each delivery port and set up the baffle that permeates water along domatic slope, the breakwater with the baffle that permeates water bury underground in sandy soil, the hole of permeating water of baffle that permeates water plant the vegetation in the sandy soil layer of the lower reaches. The invention adopts the water baffle and the permeable baffle to act as the water delivery channel, the construction of the desertification zone where the water baffle and the permeable baffle are laid is very simple, and in the water delivery process, water flows in the sandy soil layer, so that the loss of water can be greatly reduced, the water utilization rate is improved, and the use cost is also greatly reduced because the natural flow mode is used for delivering water.
Description
Technical Field
The invention relates to a sand water and soil conservation system and a method, in particular to a system and a method for governing and improving a severe natural environment, and a system and a method for irrigating vegetation in deserts or desertification zones.
Background
In the comprehensive control of water and soil loss areas, afforestation or shrub and other plants planting in deserts or desertification zones is an essential link. The vegetation coverage rate is improved, the river silt in rainy season is reduced, the water and soil are fixed, the local ecological environment is improved, and the regional climate is regulated, so that the method is beneficial to all but harmless. However, the irrigation problem (especially seedling period) of vegetation is difficult to solve in the water and soil conservation engineering construction due to small precipitation and large evaporation in desert areas, so that the survival rate of vegetation is low, the roots of the vegetation are not developed enough to play a role in water and soil conservation, and the problem becomes a big difficulty in water and soil conservation work in China. At present, the irrigation measures of vegetation usually adopted in China are mostly to take water from river channels or extract underground water, and channels are built for irrigation. In real-world operation, the effect of this irrigation method is quite undesirable and there are many drawbacks: (1) The water taking facility has high operation cost and needs to be manually maintained regularly to ensure the normal operation of the water taking facility; (2) Irrigation needs to be carried out by excavating channels, the channel excavating cost in desert areas is high, the loss in daily operation is large, regular maintenance is needed, and the cost is greatly increased; (3) Facilities such as open channels and the like are seriously influenced by the surrounding environment, the evaporation loss of water in the channels is also very serious, the irrigation benefit is greatly influenced, and the irrigation cost is increased.
Disclosure of Invention
In order to overcome the problems of the prior art, the invention provides a sand water and soil conservation system and a sand water and soil conservation method. The method and the system utilize the characteristics of strong water permeability and large permeability coefficient of the sandy soil, not only convey the water, but also reduce the water loss in the water conveying process.
The purpose of the invention is realized as follows: a sand soil and water conservation system comprising: the higher water storage box that sets up on domatic of top of slope or relief, the water storage box connect the trunk pipe, the trunk pipe lay along domatic downward sloping, the trunk pipe on set up bleeder or the breakwater of a plurality of level differences, bleeder or breakwater lay along domatic downward sloping, bleeder or breakwater on arrange a plurality of delivery ports, correspond each delivery port and set up the baffle that permeates water along domatic slope, the breakwater with the baffle that permeates water bury underground in sand, the hole downstream sand layer that permeates water of the baffle plant the vegetation.
Further, the water body in the water storage tank is from groundwater or river water intake.
Furthermore, the main pipe is placed on the surface of a sandy soil layer or is buried in the sandy soil layer.
Furthermore, the water baffle and the permeable baffle are straight plates inserted into a clay layer below the sandy soil layer and form a V-shaped groove with the clay layer.
Furthermore, the water baffle and the water permeable baffle are V-shaped plates.
Further, the water delivery capacity of the V-shaped groove or the V-shaped plate is calculated according to the following formula:
calculating the water delivery quantity Q:
Q=KJA 1
wherein: q is the flow of the V-shaped groove; k is the permeability coefficient; a. The 1 The flow area of the V-shaped groove is used; j is hydraulic gradient.
Wherein the water passing area A is calculated 1 ：
A 1 =L 2 ×cosα×sinα
Wherein: l is the minimum length that the baffle should meet; alpha is an included angle formed by the baffle and the cohesive soil layer or a bottom angle of a V-shaped plate.
Further, the calculation formula of the permeable holes on the permeable baffle is as follows:
water outlet capacity Q of water permeable hole in unit time 2 ：
Q 2 = KJA 2
Wherein: a. The 2 The area of the water-permeable hole; k is the permeability coefficient; j is the hydraulic gradient;
determination of arrangement distance L3 of the water permeable holes:
L3=2h/tanβ
wherein: beta is the diffusion angle of water in soil;
the arrangement of the permeable holes meets the following conditions:
W3=（a+l）b×ET×B
wherein: w3 is the water demand of the corresponding irrigation area of a single water permeable hole in a unit time interval, and a is the width of the water permeable hole; l: the distance between the water permeable holes; b is planting density; b is the vegetation bandwidth; ET is the plant transpiration amount per unit area.
Further, the distance between the water surface of the water passing section of the V-shaped groove or the V-shaped plate and the ground surface should meet the following conditions:
h1＜h＜h2
wherein: h1 is: the submerged evaporation burial depth of the local soil; h is: distance from the water permeable holes to the vegetation zone; h2 is: the maximum buried depth of water available to the plant root system.
A sand water and soil conservation method using the system comprises the following steps:
laying a water and soil conservation system: arranging a water storage tank on the top or slope of the slope with higher terrain, and sequentially connecting a main pipe, a branch pipe or a water baffle and a permeable baffle; bury breakwater or the baffle that permeates water in sandy soil layer, if sandy soil layer is thinner, then use the straight slab: inserting the straight plate into the sandy soil layer and reaching the clay layer below the sandy soil layer to form a V-shaped groove between the straight plate and the clay layer; if the sandy soil layer is thicker or the clay layer is not arranged below the sandy soil layer, the V-shaped plate is used; the embedding depth of the water permeable baffle is adapted to the root system of the irrigated plant;
a step of water storage: using a motor-pumped well or a river to take water and accumulating irrigation water in a water storage tank;
a step of water diversion: the irrigation water in the water storage tank is distributed into each branch pipe or water baffle plate through the main trunk pipe by utilizing gravity, and the flow of the water in the water baffle plate is as follows: the water flows in the sandy soil of a V-shaped groove formed by the V-shaped water baffle or the straight water baffle and the clay layer;
and (3) irrigation: in each lateral pipe or breakwater baffle permeates water baffle with rivers distribution, rivers in each baffle that permeates water offer plant roots through permeating water the hole and absorb, the flow of water in the baffle that permeates water is: flows in the sandy soil of a V-shaped groove formed by the V-shaped baffle or the straight plate and the clay layer.
The invention has the following beneficial effects: the invention adopts the water baffle and the permeable baffle to act as the water delivery channel, the construction of the desertification zone where the water baffle and the permeable baffle are laid is very simple, and in the water delivery process, water flows in the sandy soil layer, the water level is kept to be lower than the diving evaporation depth of sandy soil and to be larger than the usable depth of vegetation, thus achieving the aims of meeting the construction requirements of the vegetation and greatly reducing the loss of water. Simultaneously, the sand and soil/desert infiltration is rapid, and the infiltration ability is strong, and under the condition of not blocking, the rapid seepage of moisture in the sand bed gets into the river course, and the breakwater can also effectively block the rainwater that the upper reaches infiltrated apart from water delivery and reduction evaporation like this, makes it get into domatic water circulating system, supplies domatic vegetation to utilize to effectively improve water utilization rate. Therefore, the use cost is greatly reduced due to the use of a natural flow mode for water delivery.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a schematic diagram of a system according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a water baffle or a water permeable baffle according to the fourth embodiment of the present invention;
fig. 3 is a schematic structural view of a water baffle or a water permeable baffle according to a fifth embodiment of the present invention.
Detailed Description
The first embodiment is as follows:
the present embodiment is a sand soil and water conservation system, as shown in fig. 1. The embodiment comprises the following steps: the water storage tank 1 that sets up on the higher domatic of slope top or relief, the water storage tank connect trunk pipe 2, the trunk pipe lay along domatic downward sloping, the trunk pipe on set up lateral pipe or breakwater 3 that a plurality of level differences, lateral pipe or breakwater lay along domatic downward sloping, lateral pipe or breakwater on arrange a plurality of delivery ports, correspond each delivery port and set up the baffle 4 that permeates water along domatic slope, the breakwater with the baffle that permeates water bury underground in sandy soil, the baffle that permeates water permeate water the hole downstream sandy soil layer in plant vegetation 5.
Drip irrigation in the existing irrigation technology is a technology capable of saving water, and is a very good environment-friendly irrigation measure. However, drip irrigation requires a large number of pipes to be built, and also requires precise control of water amount during irrigation, that is, a control system. For desertification control or large scale desert control, this precise water supply is too costly to be implemented. The irrigation system that this embodiment provided uses the self-flowing irrigation completely to utilize the water permeability that sand and soil layer possesses to carry water, do not use too much pipeline, just can directly deliver to the root system of plant with water, reduce simultaneously or avoided the evaporation loss of water in transportation process. But the construction cost of the whole system is greatly reduced, and the use cost is very low due to natural flow irrigation, so that the system can completely treat large-area sandy soil.
The main idea of this embodiment is: establishing a self-flowing tree-shaped water distribution system, arranging permeable plates at the tail ends of the respective systems, embedding the permeable plates in a sandy soil layer, enabling water to flow in the sandy soil layer in the permeable plates, arranging permeable holes on the permeable plates, and planting plants in the downstream of the permeable holes to realize irrigation.
The tree-shaped water distribution system firstly needs a water source arranged at a height-controlling point, namely a water storage tank. The water storage tank can be made of materials capable of bearing certain pressure, such as brick and tile cement, and can be used for constructing a water pool and the like. The water source may be derived from a river or may be drawn from groundwater. It should be noted that: the system described in the embodiment is only a part of a large irrigation system, the whole large irrigation system can be very extensive, and the system described in the embodiment is composed of a plurality of systems to realize the treatment of large desertification lands or deserts.
The main pipe is laid obliquely downwards along the slope surface, can be placed on the surface of sandy soil layer, and also can be buried in the sandy soil layer according to the requirements of terrain and topography. The material of the trunk pipe needs to bear the capacity of pressure certainly, can use the plastics tubular product of easy degradation, and after using a period, vegetation forms flourishing root system, when no longer needing artificial irrigation, can degrade promptly, reduces the influence to the environment.
The branched pipe may be a pipe or a water baffle. When the water quantity is sufficient and the external evaporation influence on water is small, the branch can adopt a water baffle, and on the contrary, a pipe is adopted.
The water baffle adopts V font structure, and similar a groove is filled with sand and soil in, and sand and soil can hold the root system of plant, also can the water delivery simultaneously, kills two birds with one stone.
The tail end of the tree-shaped distribution system adopts a water baffle plate form, and various plants can be planted along the water-permeable baffle plate by utilizing the characteristics of the water baffle plate that the water baffle plate can be used for both irrigation and water delivery, and water is supplied in the seedling period of the plants.
Example two:
the embodiment is an improvement of the first embodiment, and is a refinement of the first embodiment about the water storage tank. The water in the water storage tank described in this embodiment is taken from groundwater or a river.
Water intake pipes can be laid on the upstream of rivers with higher topography, and water is led to a desertification area to be treated by utilizing natural flow and enters a water storage tank. And underground water can be pumped for irrigation.
Example three:
this embodiment is a modification of the above embodiment, and is a refinement of the above embodiment with respect to the trunk pipe. The main pipe described in this embodiment is either placed on the surface of a sandy soil layer or buried in a sandy soil layer.
The main pipe is placed on the surface of a sandy soil layer, and the method further comprises the step of assuming the main pipe to be in the air due to the terrain, wherein the main pipe is partially underground, partially on the ground surface and partially in the air under the complex terrain condition, and is mainly suitable for the requirements of the terrain on site.
Example four:
the embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment with respect to the water baffle and the water permeable baffle. The water guard plate and the water permeable guard plate described in this embodiment are straight plates 301 inserted into the clay layer 7 under the sand layer 6, and form V-shaped grooves with the clay layer, as shown in fig. 2.
In the area that the sandy soil layer is thinner, can use the straight board, insert in the sandy soil layer, until inserting in the clay layer below the sandy soil layer, utilize the relatively poor characteristics of water permeability of clay layer, form the V-arrangement groove with the straight board, though there is sandy soil in the V-arrangement groove, the water permeability of sandy soil is better, can carry water. The insertion construction of the straight plate is very simple, and a large amount of manpower and material resources can be saved. In some desertification zones of river banks, the construction mode can be popularized due to the fact that the desertification layer is shallow, and cost is reduced.
Example five:
the embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment with respect to the water baffle and the water permeable baffle. The water deflector and water permeable baffle described in this embodiment is a V-shaped plate 302, as shown in fig. 3.
In some areas with thick sand layers, the V-shaped plates can be used, and the connection is very simple. When the water pipes are connected, the water pipes are connected in a threaded mode by using pipe joints. The use of V-shaped plates is much more convenient, similar to lap-joint sinks, simply by placing the downstream sink below the outlet end of the upstream sink. The V-shaped plate of this embodiment can punch in the position that needs the branch water when as the water delivery groove, and the V font board of low reaches only need put in the below of apopore can, the construction is very simple.
Example six:
this embodiment is a modification of the above embodiment, and is a refinement of the above embodiment with respect to the V-shaped groove or the V-shaped plate. The water delivery capacity of the V-shaped groove or the V-shaped plate in this embodiment is calculated according to the following formula:
calculating the water delivery quantity Q:
Q=KJA 1
wherein: q is the flow of the V-shaped groove; k is the permeability coefficient; a. The 1 The square meter is a V-shaped groove open area (square meter); j is the hydraulic gradient.
Wherein, the water passing area A is calculated 1 ：
A 1 =L 2 ×cosα×sinα
Wherein: l is the minimum length that the baffle should meet; alpha is an included angle formed by the baffle and the cohesive soil layer or a bottom angle of the V-shaped plate.
Example seven:
this embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the water permeable holes on the water permeable baffle. The calculation formula of the permeable holes on the permeable baffle in this embodiment is as follows:
water outlet capacity Q of water permeable hole in unit time 2 ：
Q 2 = KJA 2
Wherein: a. The 2 Water permeable hole area (square meter); k is the permeability coefficient; j is the hydraulic gradient;
determination of arrangement distance L3 (m) of water permeable holes:
L3=2h/tanβ
wherein: beta is the diffusion angle of water in soil;
the arrangement of the permeable holes meets the following conditions:
W3=（a+l）b×ET×B
wherein: w3 is the water demand of the corresponding irrigation area of a single water permeable hole in a unit time interval, and a is the width (m) of the water permeable hole; l: the distance between the water permeable holes; b is planting density; b is the vegetation bandwidth (m); ET is the plant transpiration amount per unit area.
Example eight:
this embodiment is a modification of the above-described embodiment, and is a refinement of the V-shaped groove or V-shaped plate of the above-described embodiment. The distance between the water surface of the water passing section of the V-shaped groove or the V-shaped plate and the ground surface should meet the following conditions:
h1＜h＜h2
wherein: h1 is: the submerged evaporation burial depth of the local soil; h is: distance from the water permeable holes to the vegetation zone; h2 is: the maximum buried depth of water available to the plant root system.
Example nine:
the embodiment is a sand soil and water conservation method using the system of the embodiment, and the method comprises the following steps:
1. laying a water and soil conservation system: arranging a water storage tank on a slope top or a slope surface with higher terrain, and sequentially connecting a main pipe, a branch pipe or a water baffle and a water permeable baffle; bury breakwater or the baffle that permeates water in sandy soil layer, if sandy soil layer is thinner, then use the straight slab: inserting the straight plate into the sandy soil layer and reaching the clay layer below the sandy soil layer to form a V-shaped groove between the straight plate and the clay layer; if the sandy soil layer is thicker or the clay layer is not arranged below the sandy soil layer, the V-shaped plate is used; the embedding depth of the water permeable baffle is adapted to the root system of the irrigated plant.
A height-making point is selected in a desertification zone, a water storage tank is arranged on the height-making point, and then a tree-shaped water distribution system is laid according to the terrain. The principle of laying is as follows: by utilizing the topography, water naturally flows to the tail end of each branch, so that the whole irrigation area can obtain sufficient irrigation water quantity.
Because of the V-shaped structure, each branch point only needs to be lapped, and if the straight plate is used, the straight plate only needs to be inserted into a sand layer, so that the construction is very simple.
2. Water storage step: the pumped well or river is used for taking water, and the irrigation water is accumulated in the water storage tank.
In the area close to the river, the water of the river can be directly used for irrigation. A water permeable pipe is arranged at the bottom of a river bed at the upstream of the river and higher than an irrigated area, and the water is guided to naturally flow to a water storage tank. Thus, natural irrigation can be realized without using any energy source, which is a very ideal irrigation mode. However, in most desertification areas, no river water can be utilized, and only the groundwater can be reasonably utilized for irrigation. The sand soil layer water delivery mode that this embodiment adopted can the effectual water yield of utilization, can protect and minimize the loss of water yield.
3. A step of water diversion: the irrigation water in the water storage tank is distributed into each branch pipe or water baffle plate through the main trunk pipe by utilizing gravity, and the flow of the water in the water baffle plate is as follows: flows in the sandy soil of a V-shaped groove formed by the V-shaped water baffle or the straight water baffle and the clay layer.
The water flow flows in the sand soil layer, so that evaporation loss can be reduced, and the method is very important for desert arid areas.
4. And (3) irrigating: in each lateral pipe or breakwater baffle permeates water baffle with rivers distribution, rivers in each baffle that permeates water offer plant roots through permeating water the hole and absorb, the flow of water in the baffle that permeates water is: flows in the sandy soil of a V-shaped groove formed by the V-shaped baffle or the straight plate and the clay layer.
The water flow flowing in the sand soil layer can also play a role in filtering in the flowing process, so that the plant root system obtains cleaner water.
Finally, it should be noted that the above is only for illustrating the technical solution of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred arrangement, it should be understood by those skilled in the art that the technical solution of the present invention (such as the form of water delivery system, the way of water delivery, the sequence of steps, etc.) can be modified or equivalently replaced without departing from the spirit and scope of the technical solution of the present invention.
Claims (6)
1. A sand water and soil conservation method using a system comprising: the water storage tank is arranged on a slope top or a slope with higher topography, the water storage tank is connected with a main pipe, the main pipe is laid along the slope in a downward inclining mode, a plurality of water baffles with different horizontal heights are arranged on the main pipe, the water baffles are laid along the slope in a downward inclining mode, a plurality of water outlets are arranged on the water baffles, water permeable baffles are arranged along the slope in an inclining mode corresponding to the water outlets, the water baffles and the water permeable baffles are buried in sandy soil, and vegetation is planted in the sandy soil layer below water permeable holes of the water permeable baffles; the water baffle and the water permeable baffle or a straight plate inserted into a clay layer under the sandy soil layer form a V-shaped groove with the clay layer; or a V-shaped plate, characterized in that the steps of the method are as follows:
laying a water and soil conservation system: arranging a water storage tank on a slope top or a slope surface with higher terrain, and sequentially connecting a main pipe, a water baffle and a water permeable baffle; bury breakwater or the baffle that permeates water in sandy soil layer, if sandy soil layer is thinner, then use the straight slab: inserting the straight plate into the sandy soil layer and reaching the clay layer below the sandy soil layer to form a V-shaped groove between the straight plate and the clay layer; if the sandy soil layer is thicker or the clay layer is not arranged below the sandy soil layer, the V-shaped plate is used; the embedding depth of the water permeable baffle is adapted to the root system of the irrigated plant;
a step of water storage: using a motor-pumped well or a river to take water and accumulating irrigation water in a water storage tank;
water diversion: the irrigation water in the water storage tank is distributed to each water baffle plate through the main trunk pipe by utilizing gravity, and the flow of the water in the water baffle plates is as follows: the water flows in the sandy soil of a V-shaped groove formed by the V-shaped water baffle or the straight water baffle and the clay layer;
and (3) irrigating: in each manger plate with the baffle that permeates water of rivers distribution, rivers in each baffle that permeates water provide plant roots through permeating water the hole and absorb, and the flow of water in the baffle that permeates water is: flows in the sandy soil of a V-shaped groove formed by the V-shaped baffle or the straight plate and the clay layer.
2. The method of claim 1 wherein the body of water in the reservoir is taken from groundwater or a river.
3. The method of claim 2, wherein the trunk pipe is either placed on the surface of the sandy soil layer or is buried in the sandy soil layer.
4. The method of claim 3, wherein the water transport capacity of the V-shaped trough or plate is calculated according to the following formula:
calculating the water delivery quantity Q:
Q=KJA 1
wherein: q is the flow of the V-shaped groove; k is the permeability coefficient; a. The 1 The flow area of the V-shaped groove is used; j is the hydraulic gradient;
wherein, the water passing area A is calculated 1 ：
A 1 =L 2 ×cosα×sinα
Wherein: l is the minimum length that the baffle should satisfy; alpha is an included angle formed by the baffle and the cohesive soil layer or a bottom angle of the V-shaped plate.
5. The method of claim 4, wherein the calculation formula of the water permeable holes of the water permeable baffle is as follows:
water outlet capacity Q of water permeable hole in unit time 2 ：
Q 2 = KJA 2
Wherein: a. The 2 The area of the water-permeable hole; k is the permeability coefficient; j is the hydraulic gradient;
determination of arrangement distance L3 of the water permeable holes:
L3=2h/tanβ
wherein: beta is the diffusion angle of water in soil;
the arrangement of the permeable holes can meet the following conditions:
W3=（a+l）b×ET×B
wherein: w3 is the water demand of the corresponding irrigation area of a single water permeable hole in a unit time interval, and a is the width of the water permeable hole; l: the distance between the water permeable holes; b is the planting density; b is the vegetation bandwidth; ET is the plant transpiration amount per unit area.
6. The method as claimed in claim 5, wherein the distance between the water surface of the water passing section of the V-shaped groove or the V-shaped plate and the ground surface satisfies the following conditions:
h1＜h＜h2
wherein: h1 is: the submerged evaporation burial depth of the local soil; h is: distance from the water permeable holes to the vegetation zone; h2 is: the maximum buried depth of water available to the plant root system.
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| CN108605687A (en) * | 2018-05-09 | 2018-10-02 | 宜昌景峰园林工程有限公司 | A kind of method of sand ground water and soil conservation |
| CN115918504B (en) * | 2022-12-06 | 2024-01-05 | 盐城市粮油作物技术指导站 | Water delivery method based on corn and soybean banded composite planting |
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| CN106342659A (en) * | 2016-08-30 | 2017-01-25 | 河口明星农业科技发展有限公司 | Plateau hillside drip irrigation system |
| CN206181906U (en) * | 2016-11-09 | 2017-05-24 | 柯敬忠 | Dark cave system of planting of abrupt slope plant |
| CN207219655U (en) * | 2017-09-26 | 2018-04-13 | 中国水利水电科学研究院 | A kind of sand ground water and soil conservation device |
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