A method for evaluating the development potential of roof gardens based on thermal safety

Abstract

The present invention discloses a method for evaluating the development potential of a roof garden based on thermal safety, and relates to the field of development potential evaluation. The method comprises: obtaining a development mode and several functional types, and constructing a time axis based on all the functional types and the development mode; obtaining several constituent units of the roof garden, obtaining a space type based on all the constituent units, and constructing a space axis based on the space type; constructing a time-space axis network based on the time axis and the space axis; and obtaining a thermal stress limit value WBGT of each functional type based on the occurrence time period of all the functional types. s ; Based on all the occurrence time periods and the development modes, a human flow abundance function is constructed; based on the spatiotemporal axis network, all the thermal stress limits WBGT s and the pedestrian abundance function, to obtain the development potential index and thermal stress redundancy; based on the development potential index, the development potential level and the thermal stress redundancy, a spatiotemporal heterogeneity matrix is ​​constructed; based on the spatiotemporal heterogeneity matrix, the development potential of urban roof gardens is evaluated to obtain an evaluation result, which can solve the problem that the existing evaluation method cannot realize the development-oriented comprehensive thermal safety level evaluation of roof gardens with complex functions, non-constant temperature conditions and non-constant pedestrian flow characteristics.

Description

Technical Field

[0001] The invention relates to the field of development potential assessment, and in particular to a method for assessing the development potential of a roof garden based on thermal safety. Background Art

[0002] Roof gardens do not require additional construction land and have important ecological and environmental value. They have now become an important urban green infrastructure and development strategy to supplement urban greening, improve urban thermal environment, and enhance urban health and well-being. Roofs are exposed to the sky and the thermal stress varies greatly throughout the year. When developing roof gardens as a type of urban green infrastructure for social, entertainment and commercial activities, it is first necessary to examine their thermal safety and assess their development level accordingly.

[0003] The existing assessment method is to assess the maximum working temperature or space thermal stress (WBGT) according to labor intensity and working time, and then assess its developability level. However, this method has the following defects:

[0004] 1) It is impossible to evaluate the thermal safety level of roof gardens with complex functions: Roof gardens usually have multiple functional types. Under each functional type, human activities and metabolic rates are different, resulting in different thermal stress limits. This method can only calculate the thermal stress limit under a given function;

[0005] 2) It is impossible to flexibly evaluate the comprehensive thermal safety of roof gardens under non-constant temperature conditions: the roof is greatly affected by solar radiation, and the temperature rises rapidly during the day and drops rapidly at night. The thermal stress of the roof space is in dynamic change (non-constant temperature conditions). This method can only calculate the safe duration of activities under constant temperature conditions, but is not applicable to non-constant temperature conditions.

[0006] 3) The impact of passenger flow abundance on thermal stress weight under non-constant passenger flow is not considered: various functions occur in different time periods, and the customer flow in the time period is also different, which will cause different degrees of importance of spatial thermal stress within a day. This method does not increase the consideration of passenger flow weight, resulting in low applicability in thermal safety assessment of new urban service space development.

[0007] In summary, this method cannot achieve a comprehensive thermal safety level assessment for roof gardens with complex functions, non-constant temperature conditions, and non-constant traffic characteristics. Summary of the invention

[0008] In order to solve the problem that the existing assessment method cannot realize the comprehensive thermal safety level assessment for the development of roof gardens with complex functions, non-constant temperature conditions, and non-constant human flow characteristics, the present invention provides a thermal safety-based roof garden development potential assessment method, the method comprising: obtaining a development mode and several functional types, and constructing a time axis based on all the functional types and the development mode; obtaining several constituent units of the roof garden, obtaining a space type based on all the constituent units, and constructing a space axis based on the space type; constructing a time-space axis network based on the time axis and the space axis; obtaining a thermal stress limit value WBGT of each functional type based on the occurrence time period of all the functional types s ; Based on all the occurrence time periods and the development modes, a human flow abundance function is constructed; based on the spatiotemporal axis network, all the thermal stress limits WBGT s and the pedestrian flow abundance function, obtain the development potential index and thermal stress redundancy; construct a spatiotemporal heterogeneity matrix based on the development potential index, development potential level and thermal stress redundancy; evaluate the development potential of urban roof gardens based on the spatiotemporal heterogeneity matrix to obtain an evaluation result.

[0009] The principle of this method is as follows: set the functional type, combine the development mode, and the different occurrence times of different functional types can be superimposed to form different time axes. Consider the construction conditions of the roof garden itself to construct the spatial axis. Different spatial types exist under different construction conditions. The construction of the spatial axis can calculate the full-time and space thermal safety characteristics of the roof garden. The two axes can construct an adaptive space-time axis network to evaluate the roof garden with complex functions; based on the functional type, set the thermal stress limit value regulations under different working conditions and human metabolic rate, introduce real-time environmental parameters, and consider non-constant temperature conditions; construct the human flow abundance function based on the set functional type, and use the dynamic function to calculate the thermal safety characteristics of the roof garden. The integral value of the numerical curve in a fixed time period is used as the thermal stress weight, and the influence of the traffic weight is included in the evaluation process, which is more in line with the actual situation. Based on the thermal stress limit and thermal stress weight, the development potential index of the roof garden is calculated under the spatiotemporal axis network. Combined with the development potential level and thermal stress redundancy, a spatiotemporal heterogeneity matrix of the roof garden development potential based on thermal safety is constructed, thus forming a practical, full-time and full-space feasibility assessment method for roof garden development. The matrix can evaluate the current development status of functions / spaces, and which specific functions / constituent units cause bad thermal effects, so as to carry out targeted optimization.

[0010] Under the settings of different functional types, users have different activity intensities and different tolerances to environmental thermal stress. This method obtains the metabolic heat production rate of the human body under each activity intensity, combined with its continuous activity time, to obtain a more accurate thermal stress limit in high-temperature places, so that the development potential index can be calculated more accurately in the later stage.

[0011] Further, the thermal stress limit WBGT is obtaineds The specific steps include: obtaining a human metabolic rate of each functional type based on the activity intensity, setting the working hours of all the functional types, and obtaining the heat stress limit value WBGT based on all the working hours and all the human metabolic rates. s .

[0012] Considering the limited carrying capacity of roof garden traffic, the upper limit of the total target number of customers attracted under different functional types is the same. Combined with the occurrence time and development mode, the actual probability of the occurrence time is set to construct the time distribution of customer traffic of each functional type, which is more in line with the actual situation of traffic. Considering the non-constant traffic, the applicability of thermal safety assessment of the development of new urban service spaces is improved, and at the same time, the development potential index can be calculated more accurately in the later stage.

[0013] Furthermore, the specific steps of constructing the crowd abundance function include: if the development mode is a single-function type development mode, constructing the crowd abundance function based on all the occurrence time periods and preset probabilities; if the development mode is a multifunctional type development mode, constructing a first crowd abundance function based on all the occurrence time periods and the preset probabilities, and superimposing all the first crowd abundance functions to construct the crowd abundance function. Among them, the single-function type development mode refers to the development of the roof garden based on only one function type, and the multifunctional type development mode refers to the development of the roof garden based on a combination of multiple function types.

[0014] Furthermore, the specific steps of obtaining the development potential index include: obtaining a first thermal stress index WBGT of the spatial axis based on environmental parameters, wherein the environmental parameters include measured temperature, measured humidity, measured black globe temperature and measured wind speed; based on the first thermal stress index WBGT and all the thermal stress limit values ​​WBGT s Obtain the time period ti of each functional type; integrate all the time periods ti based on the crowd abundance function to obtain the development potential index sub-item ai within each time period ti, and sum all the development potential index sub-items ai to obtain the development potential index. Combined with the influence of thermal stress limit and crowd abundance, the actual thermal safety evaluation result of the roof garden can be obtained more accurately.

[0015] Furthermore, the specific steps of obtaining thermal stress redundancy include: obtaining a second thermal stress index WBGT based on all the function types and all the time periods ti, and obtaining a second thermal stress index WBGT based on the second thermal stress index WBGT and all the thermal stress limits WBGT s The thermal stress redundancy is obtained. The thermal stress redundancy can reflect the sensitivity of the development potential of the roof garden in different functional types and different time and space, thereby providing feedback for the optimization of the development mode.

[0016] Furthermore, if the development mode is the single functional type development mode, the first calculation method for obtaining the human flow abundance function is:

[0017]

[0018] Among them, I(t) represents the flow abundance function, μ represents the mean of normal distribution, σ represents the standard deviation, and t represents the time period of occurrence.

[0019] Furthermore, if the development mode is the multifunctional development mode, the second calculation method for constructing the human flow abundance function is:

[0020]

[0021] Among them, I(t) represents the first flow abundance function, I 组合 (t) represents the flow abundance function, μ represents the mean of normal distribution, σ represents the standard deviation, t represents the occurrence time period, i represents the number of functional types, and n represents the number of functional types.

[0022] Furthermore, a third calculation method for obtaining the development potential index sub-item ai is:

[0023]

[0024] Among them, ai represents the sub-item of the development potential index, I(t) represents the human flow abundance function, t1 represents the time period ti, and j represents the sequence number of the time period ti.

[0025] Furthermore, a fourth calculation method for obtaining the development potential index is:

[0026]

[0027] Among them, A represents the development potential index, μ represents the mean of normal distribution, and σ represents the standard deviation.

[0028] Furthermore, the fifth calculation formula for obtaining the thermal stress redundancy is:

[0029]

[0030] Among them, △WBGT represents thermal stress redundancy, WBGT s Indicates the thermal stress limit, WBGT i represents the kth second thermal stress index WBGT, k represents the sequence number of the second thermal stress index WBGT, and m represents the number of the second thermal stress index WBGT.

[0031] One or more technical solutions provided by the present invention have at least the following technical effects or advantages:

[0032] 1. Construct a time axis based on all functional types and development modes; obtain spatial types based on all constituent units, and construct spatial axes based on spatial types; construct a spatiotemporal axis network based on the time axis and spatial axis; in the time dimension, the actual functional types and functional type combinations are considered, so that roof gardens with complex functions can be evaluated; in the spatial dimension, the impact of the heterogeneous spatial composition of roof gardens is considered, and the full-time and space thermal safety characteristics of roof gardens are considered, which provides a comprehensive and flexible assessment boundary setting for the evaluation of the developable level of roof gardens, so that this method can be flexibly applied to various application scenarios.

[0033] 2. Based on the activity intensity, the human metabolic rate of each functional type is obtained, the working hours of all functional types are set, and the heat stress limit WBGTs is obtained based on all working hours and all human metabolic rates; based on the functional type setting and referring to the heat stress limit regulations under different working conditions and human metabolic rates, more accurate heat stress limits for high temperature places and heat stress limit combinations under multi-function type settings can be obtained.

[0034] 3. If the development mode is a single-function type development mode, a crowd abundance function is constructed based on all occurrence time periods and preset probabilities; if the development mode is a multi-function type development mode, a first crowd abundance function is constructed based on all occurrence time periods and preset probabilities, and all first crowd abundance functions are superimposed to construct a crowd abundance function; the time distribution of customer traffic of each functional type is constructed to be more in line with the actual situation of traffic, and the consideration of crowd weight is increased. Considering the non-constant traffic, the applicability of thermal safety assessment of urban new service space development can be improved.

[0035] 4. Obtain the first thermal stress index WBGT of the spatial axis based on environmental parameters; obtain the time period ti of each functional type based on the first thermal stress index WBGT and all thermal stress limits WBGTs; integrate all time periods ti based on the human flow abundance function to obtain the development potential index sub-item ai within each time period ti, and sum all development potential index sub-items ai to obtain the development potential index. Obtain the test thermal stress level WBGT based on conventional meteorological parameters, obtain the human metabolic rate under actual activity mode, and combine with the current standards to quickly calculate the developable level of the roof garden based on thermal safety, which is conducive to rapid preliminary project assessment; introduce human flow abundance, increase the consideration of human flow weight, so that thermal availability can be obtained at any time according to the human flow abundance function, and more accurately obtain the actual thermal safety evaluation results of the roof garden.

[0036] 5. Based on all functional types and all time periods ti, the second thermal stress index WBGT is obtained, and the thermal stress redundancy is obtained based on the second thermal stress index WBGT and all thermal stress limits WBGTs. The thermal stress redundancy can reflect the sensitivity of the roof garden's development potential in different functional types and different time and space, thereby providing feedback for the optimization of the development model.

[0037] 6. Construct a spatiotemporal heterogeneity matrix based on the development potential index, development potential level and thermal stress redundancy; evaluate the development potential of urban roof gardens based on the spatiotemporal heterogeneity matrix to obtain evaluation results. The matrix can obtain the thermal safety evaluation results of roof gardens based on the evaluation results, and can specifically obtain which functions or spaces cause bad thermal effects, and can optimize the design in a targeted manner to obtain a better development plan that meets the conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of the present invention, and do not constitute a limitation on the embodiments of the present invention;

[0039] Figure 1 It is a schematic diagram of the process of the present invention;

[0040] Figure 2 It is a schematic diagram of constructing a spatial axis based on four typical space types, namely, space above grass, space under trees, platform space, and equipment space, in the present invention, wherein M-1, M-2, M-3, and M-4 respectively represent monitoring points of environmental parameters in space above grass, space under trees, platform space, and equipment space, the left side diagram represents the distribution diagram of each monitoring point, and the right side diagram represents the distribution diagram of each monitoring point in the real view of the roof garden;

[0041] Figure 3 It is a schematic diagram of the thermal stress warning limit value in a high temperature place in the present invention;

[0042] Figure 4 It is a schematic diagram of the time period ti that meets the thermal stress requirement (≤WBGTs) within the function occurrence interval in the present invention, wherein x represents the time period that meets the thermal comfort requirement, and y represents the time period that does not meet the thermal comfort requirement. DETAILED DESCRIPTION

[0043] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those within the scope of this description. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0045] Embodiment 1

[0046] refer to Figure 1 This embodiment provides a method for evaluating the development potential of a roof garden based on thermal safety, the method comprising:

[0047] Acquire a development model and several functional types, and construct a time axis based on all the functional types and the development model; acquire several constituent units of the roof garden, obtain space types based on all the constituent units, and construct a space axis based on the space types; construct a time-space axis network based on the time axis and the space axis;

[0048] Obtain the thermal stress limit value WBGT for each function type based on the occurrence time period of all the function types s The specific steps include: obtaining the human metabolic rate of each functional type based on the activity intensity, setting the working hours of all functional types, and obtaining the heat stress limit value WBGT based on all the working hours and all the human metabolic rates. s ;

[0049] Constructing a human flow abundance function based on all the occurrence time periods and the development mode; the specific steps include: if the development mode is a single-function type development mode, constructing the human flow abundance function based on all the occurrence time periods and preset probabilities; if the development mode is a multifunctional type development mode, constructing a first human flow abundance function based on all the occurrence time periods and the preset probabilities, and superimposing all the first human flow abundance functions to construct the human flow abundance function;

[0050] Based on the space-time axis network, all the thermal stress limits WBGT s and the human flow abundance function, obtaining the development potential index and the heat stress redundancy;

[0051] The specific steps of obtaining the development potential index include: obtaining the first thermal stress index WBGT of the spatial axis based on environmental parameters, wherein the environmental parameters include measured temperature, measured humidity, measured black globe temperature and measured wind speed; obtaining the first thermal stress index WBGT based on the first thermal stress index WBGT and all the thermal stress limit values ​​WBGT s Obtaining a time period ti for each functional type; integrating all the time periods ti based on the human flow abundance function to obtain a development potential index sub-item ai within each time period ti, and summing all the development potential index sub-items ai to obtain the development potential index;

[0052] The specific steps of obtaining thermal stress redundancy include: obtaining a second thermal stress index WBGT based on all the function types and all the time periods ti, and obtaining a second thermal stress index WBGT based on the second thermal stress index WBGT and all the thermal stress limits WBGT s obtaining the thermal stress redundancy;

[0053] constructing a spatiotemporal heterogeneity matrix based on the development potential index, the development potential level and the thermal stress redundancy;

[0054] The development potential of urban roof gardens is evaluated based on the spatiotemporal heterogeneity matrix to obtain the evaluation results.

[0055] Embodiment 2

[0056] On the basis of the first embodiment, in this embodiment, if the development mode is the single function type development mode, the first calculation method for obtaining the human flow abundance function is:

[0057]

[0058] Among them, I(t) represents the flow abundance function, μ represents the mean of normal distribution, σ represents the standard deviation, and t represents the time period of occurrence;

[0059] If the development mode is the multifunctional development mode, the second calculation method for constructing the human flow abundance function is:

[0060]

[0061] Among them, I(t) represents the first flow abundance function, I 组合 (t) represents the flow abundance function, μ represents the mean of normal distribution, σ represents the standard deviation, t represents the occurrence time period, i represents the number of functional types, and n represents the number of functional types;

[0062] The third calculation method for obtaining the development potential index sub-item ai is:

[0063]

[0064] Among them, ai represents the sub-item of the development potential index, I(t) represents the human flow abundance function, t1 represents the time period ti, and j represents the serial number of the time period ti;

[0065] The fourth calculation method for obtaining the development potential index is:

[0066]

[0067] Among them, A represents the development potential index, μ represents the mean of normal distribution, and σ represents the standard deviation;

[0068] The fifth calculation formula for obtaining the thermal stress redundancy is:

[0069]

[0070] Among them, △WBGT represents thermal stress redundancy, WBGT s Indicates the thermal stress limit, WBGT i represents the kth second thermal stress index WBGT, k represents the sequence number of the second thermal stress index WBGT, and m represents the number of the second thermal stress index WBGT.

[0071] Embodiment 3

[0072] On the basis of the above embodiment, in this embodiment, it is set that the roof garden is developed based on three functional types, namely sports and fitness (SF), theme dining (RE) and collective activities (AC). SF occurs in the a1 and a2 time periods of a day, RE occurs in the b1 and b2 time periods of a day, and AC occurs in the c1 and c2 time periods of a day. Then, a timeline is constructed in combination with the optional development mode and the functional type, as shown in Table 1;

[0073] Table 1

[0074] Serial number Development Mode Occurrence time period 1 SF a1 2 SF a2 3 SF a1+a2 4 RE b1 5 RE b2 6 RE b1+b2 7 AC c1 8 AC c2 9 AC c1+c2 10 SF+RE a1+a2+b1+b2 11 SF+AC a1+a2+c1+c2 12 RE+AC b1+b2+c1+c2 13 SF+RE+AC a1+a2+b1+b2+c1+c2

[0075] The roof garden is a compound house garden composed of three types of plants: trees, shrubs, and grass. At the same time, the roof garden generally has an activity platform and roof equipment such as air conditioners and elevator rooms. The roof garden contains four typical space types: grass space, tree space, platform space, and equipment space. The four space types construct the space axis, such as Figure 2 As shown in the figure, the grass space (measurement point M-1) is located above a lawn in the roof garden, the tree space (measurement point M-2) is located under the tree in the east side of the tree and shrub area, the platform space (measurement point M-3) is located on the circular walkway of the skylight platform, and the equipment space (measurement point M-4) is located next to the equipment host. During the selected measurement period, the four measurement points are continuously monitored, and the environmental parameters required for calculating WBGT are recorded at each measurement point by the minute, such as the measured temperature, measured humidity, measured black globe temperature, and measured wind speed.

[0076] This example is based on a body weight of 70 kg and a body surface area of ​​1.8 m 2The heat stress level is calculated using a standard human model, where the standard human model refers to a 3D model of a group of people with a stable and representative metabolic rate that can be used as a basis for comparison. According to the Determination of Metabolic Rate in Ergonomic Thermal Environments (GB T 18048-2008), the human metabolic heat production rate under various activity intensities is shown in Table 2. The metabolic rate values ​​of human activity types under the three functional types of SF, RE, and AC are determined to be 220 W / m 2 、58W / m 2 and 70W / m 2 ;

[0077] Table 2

[0078] Activity intensity <![CDATA[Metabolic heat production rate (W / m 2 )]]> Lying down 46 Sit and rest 58 Standing Rest 70 Seated activities (in offices, houses, schools, laboratories, etc.) 70 Standing activities (shopping, light labor in the laboratory, etc.) 93 Standing activities (store clerk, housework, light mechanical processing, etc.) 116 Medium activities (heavy machining, repairs, car washing, etc.) 185 Heavy activity 200-250

[0079] Refer to the mainstream thermal safety assessment standards, such as the provisions of the recommended warning limits (RALs) of thermal stress in high temperature places for the standard human model in "Criteria for a recommended standard: occupational exposure to heat and hot environments", and determine the thermal stress limits WBGTs of the three functional types based on the typical duration of different activities. The working hours of SF, RE and AC are set to 15 minutes, 30 minutes and 60 minutes respectively. Figure 3 As shown, the WBGTs of the three functional thermal stress limits of SF, RE and AC are approximately 27℃, 32℃ and 30℃ respectively. For example, the metabolism of SF is 220W / m 2 , the working time is 15 minutes, then the WBGTs is 27℃;

[0080] Assuming that the occurrence time periods of SF are 5:00-8:00 and 19:00-22:00, the occurrence time periods of RE are 11:00-14:00 and 17:00-22:00, and the occurrence time periods of AC are 8:00-12:00 and 13:00-17:00, assuming that the occurrence time periods of the above functional types are consistent with the actual situation with a probability of 95%, that is, the preset probability is 95%, modify the normal distribution probability density function, and construct the human flow abundance function under the single functional type development mode and the multifunctional type development mode, as shown in Table 3 and Table 4, respectively, where I1(t) to I 13 (t) represents the human flow abundance function of the three functional types in different occurrence time periods under different development modes;

[0081] Table 3

[0082]

[0083] Table 4

[0084]

[0085] According to the selected development mode, the space-time axis network is configured to determine the required human flow abundance function, as shown in Table 5:

[0086] Table 5

[0087]

[0088]

[0089] The WBGT of each typical space is calculated by the tested environmental parameters. Since the minute-by-minute change of WBGT is not obvious, in order to reflect the change of WBGT and reduce the amount of calculation, this embodiment calculates the average WBGT with a time scale of 15 minutes; according to the WBGTs values ​​set under different functional types, the time period ti (ti is a series of 15-minute time periods) that meets the thermal stress requirements (≤WBGTs) within the occurrence time period of the functional type is calculated and identified, such as Figure 4 As shown;

[0090] According to the integration of the selected human flow abundance function in the time period ti, the development potential index sub-item ai in each time period ti is obtained, and then the development potential index is obtained by summing ai in the functional occurrence interval (μ-2σ, μ+2σ);

[0091] Assuming that the occurrence time period of the functional type is consistent with the actual situation with a probability of 95%, that is, the preset probability is 95%, the development potential index is distributed between 0-0.95, and the development potential level is divided into five levels (Ⅰ, Ⅱ, Ⅲ,

[0092] IV, V), among which grade I is the highest and grade V is the lowest, as shown in Table 6:

[0093] Table 6

[0094] Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ 0.8≤A≤0.95 0.6≤A＜0.8 0.4≤A＜0.6 0.2≤A＜0.4 0≤A＜0.2

[0095] In the occurrence period that meets the thermal stress limit WBGTs, that is, in the time period ti, the mean value of the difference between WBGTs and the actual WBGT (ΔWBGT) is defined as the thermal stress redundancy, which can reflect the sensitivity of the development function type to the thermal stress limit (the smaller the value, the higher the sensitivity);

[0096] According to the above calculation results, a spatiotemporal heterogeneity matrix is ​​drawn, which includes the spatiotemporal heterogeneity matrix of the roof garden developability level based on thermal safety and the spatiotemporal heterogeneity matrix of the roof garden thermal redundancy. If the spatiotemporal heterogeneity matrix of the roof garden developability level based on thermal safety obtains a poor thermal safety evaluation result of the roof, then we can find out which specific functional types / space types cause the poor thermal effect from the roof garden thermal redundancy spatiotemporal heterogeneity matrix, and then optimize the design in a targeted manner, and then recalculate to obtain a better development plan that meets the conditions.

[0097] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0098] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for evaluating the development potential of a roof garden based on thermal safety, characterized in that: The method comprises: Acquire a development model and several functional types, and construct a time axis based on all the functional types and the development model; acquire several constituent units of the roof garden, obtain space types based on all the constituent units, and construct a space axis based on the space types; construct a time-space axis network based on the time axis and the space axis; Obtain the thermal stress limit value WBGT for each function type based on the occurrence time period of all the function types s ; constructing a human flow abundance function based on all said occurrence time periods and said development patterns; Based on the space-time axis network, all the thermal stress limits WBGT s and the human flow abundance function, obtaining the development potential index and the heat stress redundancy; constructing a spatiotemporal heterogeneity matrix based on the development potential index, the development potential level and the thermal stress redundancy; Based on the spatiotemporal heterogeneity matrix, the development potential of urban roof gardens is evaluated to obtain evaluation results; Get the thermal stress limit WBGT s The specific steps include: The human metabolic rate of each functional type is obtained based on the activity intensity, the working time of all functional types is set, and the heat stress limit value WBGT is obtained based on all the working time and all the human metabolic rates. s ; The specific steps of constructing the crowd abundance function include: If the development mode is a single-function type development mode, the human flow abundance function is constructed based on all the occurrence time periods and the preset probabilities; if the development mode is a multifunctional type development mode, a first human flow abundance function is constructed based on all the occurrence time periods and the preset probabilities, and the human flow abundance function is constructed by superimposing all the first human flow abundance functions; The specific steps to obtain the development potential index include: A first thermal stress index WBGT of the spatial axis is obtained based on environmental parameters, wherein the environmental parameters include measured temperature, measured humidity, measured black globe temperature and measured wind speed; based on the first thermal stress index WBGT and all the thermal stress limit values ​​WBGT s Obtaining a time period ti for each functional type; integrating all the time periods ti based on the human flow abundance function to obtain a development potential index sub-item ai within each time period ti, and summing all the development potential index sub-items ai to obtain the development potential index; Specific steps to achieve thermal stress redundancy include: A second thermal stress index WBGT is obtained based on all the function types and all the time periods ti, and a second thermal stress index WBGT is obtained based on the second thermal stress index WBGT and all the thermal stress limits WBGT. s The thermal stress redundancy is obtained.

2. A method for evaluating the development potential of a roof garden based on thermal safety according to claim 1, characterized in that: If the development mode is the single functional type development mode, the first calculation method for obtaining the human flow abundance function is: Among them, I(t) represents the flow abundance function, μ represents the mean of normal distribution, σ represents the standard deviation, and t represents the time period of occurrence.

3. A method for evaluating the development potential of a roof garden based on thermal safety according to claim 1, characterized in that: If the development mode is the multifunctional development mode, the second calculation method for constructing the human flow abundance function is: Among them, I(t) represents the first flow abundance function, I 组合 (t) represents the flow abundance function, μ represents the mean of normal distribution, σ represents the standard deviation, t represents the occurrence time period, i represents the number of functional types, and n represents the number of functional types.

4. The method for evaluating the development potential of a roof garden based on thermal safety according to claim 1 is characterized in that: The third calculation method for obtaining the development potential index sub-item ai is: Among them, ai represents the sub-item of the development potential index, I(t) represents the human flow abundance function, t1 represents the time period ti, and j represents the sequence number of the time period ti.

5. A method for evaluating the development potential of a roof garden based on thermal safety according to claim 4, characterized in that: The fourth calculation method for obtaining the development potential index is: Among them, A represents the development potential index, μ represents the mean of normal distribution, and σ represents the standard deviation.

6. The method for evaluating the development potential of a roof garden based on thermal safety according to claim 1 is characterized in that: The fifth calculation formula for obtaining the thermal stress redundancy is: Among them, △WBGT represents thermal stress redundancy, WBGT s Indicates the thermal stress limit, WBGT i represents the kth second thermal stress index WBGT, k represents the sequence number of the second thermal stress index WBGT, and m represents the number of the second thermal stress index WBGT.

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