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ENVISIONING SUSTAINABLE LANDSCAPE MANAGEMENT IN THE ENVIRONMENTALLY SENSITIVE AREAS OF KSOUR ESSEF, TUNISIA

Each territory has distinctive features and landscape compositions that contribute to the creation of territorial identities. Natural parks are territories remarkable for their wealth of biodiversity, which in turn contribute to the development of sustainable socio-economic development through landscape enhancement. The main idea of this research is to test the combinaison of two concepts to propose a suitable management in a semi-arid environment. It is based on the use of the ESAs and landscape diagnosis concepts. The concept of ESAs is supported including the need to identify environnementally sensitive lands based on the hypotheses of MEDALUS project model. However, the landscape diagnosis is based on the combination of landscape potential and social requirements. Results aimed to create ecological and environmental models based on natural materials such as wood, light minerals and a diversified and multicoloured plant palette, including the logic of working with nature and preserving its particularity by promoting sustainable local development criteria and create a new green city.


INTRODUCTION
Since the early 19th century, forests have been the scene of urban growth and have sometimes been transformed into green and wooded areas or urban forest parks. With the evolution of large urban areas, the need for space for new construction has caused problems following deforestation, fires and the degradation of peri-urban natural areas. Today, despite these disadvantages, several countries have become more aware of and respectful of periurban forests through the development of fields of activity in these areas. Forests are multifunctional spaces, offering both tangible and intangible services. In Japan or Australia, the demand for recreational spaces has encouraged public authorities and local authorities to invest in forests to benefit from their environmental and social functions. In France, the social perception and representation of forests are very closely linked to leisure activities (Papillon, 2014). In Tunisia, peri-urban forests were transformed into public parks in the summer following the program of 100 parks that began in 1996. The objectives of creating these parks are essentially to improve the living conditions of city dwellers and to preserve the natural spaces adjacent to the cities. Among the forests that have been transformed into public parks are (Nahli, El Mourouj, Farhat Hached, El Hmeda,...). Today, these forests converted into peri-urban parks do not meet society's needs for a pleasant natural living environment and also for leisure. Periurban forests require new recognition and also a rethinking of their future. The example of the Ksour Essef periurban park is our study support, in order to assess its current state and propose solutions that can remedy the disadvantages and offer the target population a better living environment in order to preserve natural resources while meeting the requirements of sustainable development. Generally, landscaping projects are based on landscape analysis, this research work consists in presenting a method of evaluating the landscape features of a regional forest natural park which has been developed in 2011 but has undergone a significant degradation of natural and managed entities following the effect of climate change and anthropogenic especially after the revolution. The status of sensitive environmental areas will be assessed by applying the Medalus method. Then, a landscape diagnosis is carried out on the ground. The comparison of the results will enable to better manage the studied space and propose a sustainable landscaping taking into account the three pillars of sustainable development.

STUDY AREA
The park is located in the delegation Ksour Essef belongs to the governorate of Mahdia and occupies an area of 16 hectares which implanted in a forest of an overall area of 50 hectares ( Figure 1). This space was actually an old stone quarry in the sixties, which after its closure in 2001, was promoted as a green space. It occupies the highest point of the city whose altitude can reach up to 66 m. This forest represents the green lung of the city, thus, it is formed of an afforestation of Aleppo pine "Pinus Halepensis" and Eucalyptus "Eucalyptus Camaldulensis". The development of the park is part of the national parks program that brings together 100 parks throughout Tunisia to improve the living environment of the population and the protection of the environment. It was open, according to the municipality of Ksour Essef, in 2002 and was valued as a forest park. Indeed, a wrought iron fence was put in place to demarcate the park and protect it with an entrance gate made by AUDEC (2002), with a sum of 28 thousand dinars. Inside the park, a fitness trail was set up in 2011 with all the physical work equipment, a refreshment bar, a play area, a "LABIB" pedestal and family rest areas with benches. But since the Tunisian revolution, in 2011, the space was destroyed and poorly maintained, therefore, it became non-functional and a wealth of landscape was lost including the components of the course.
The delegation of Ksour Essef belongs to the governorate of Mahdia located south-east of the Tunisian sahel, 200 km from the capital Tunis and 12 km from the city of Mahdia with an area of 40 Km² and 54 366 inhabitants in 2014. It is located on a moderate hill, and encloses a coastal zone stretching 13 Km ( Figure 1). According to the National Meteorological Institute of Tunis (2017), the city of Ksour Essef is known for a warm, dry Mediterranean climate in summer, humid and temperate in winter with a maximum average temperature of 31 ° C and a minimum average of 6 ° C. The city is also known by winds on the east side in summer and on the west side in winter, whose west winds are dominant and can reach up to 80 m/s. Potential evapotranspiration (PET) varies from 1319 to 1321 mm / year in 2010. According to the Regional Commissariat for Agricultural Development (CRDA, 2014), Ksour Essef contains the water table "Melloulech", where 1446 water wells produce 2.91 million m 3 /year with a variable salinity between 3 to 15 g/l. It belongs to the "Sahel Sfax" water table, consisting of 22 water wells, producing 3.15 million m 3 of water. The Territorial Extension Cell (CTV, 2002), has mentioned that the irrigated perimeters at Ksour Essef occupy a total of 110 hectares spread over 152 farmers. It despites a water salinity of 4.3 g/l of salt. However, Ksour Essef is built on a succession of hills with altitudes that vary between 6 m and 30 m and the neighboring altitude hills reaches 65 m. The delegation of Ksour Essef is home to several types of soils, and the predominance of low input soils, isohumic soils and raw mineral soils on the north side. In the southern part, the soils are raw limestones, while in the center there is a diversity such as halomorphic soils, rendzines and complex units. The raw mineral soils are located on a steep slope where the surface layers are constantly entrained thus preventing the formation of soil from which the vegetation cover is very insignificant. This type of soil is mainly present in the northern and north-eastern part of Ksour Essef, with a succession of hills reachs 66 m. The poorly evolved soils are generally located in semi-arid areas, characterized by a low degree of weathering, a humic horizon and a structure that is often weak. Isohumic soils are characterized by a dominance of clays found in the forest of Ksour Essef ( Figure 2). The land use of the town of Ksour Essef is subdivided into two parts: the coastal side presents a variety of crops including cereals (barley and wheat), forage crops (sorghum, maize, oats ...), market gardening (pepper, tomato, potato, zucchini, cucumber, carrot, onion, melon, eggplant, pea, squash, watermelon, garlic ...), spices (cumin, choriambe) and olive groves. Further, cereal crops persist in the west one ( Figure 3).  The delegation of Ksour Essef has a population of 54,366 inhabitants in 2014. The economic development of the city of Ksour Essef is based on the trade where there are more than 300 points of sale in detail. The participation rate is 38.87 % while the unemployment rate is 9.83 %, which shows that despite the reduction in the number of jobs in the city, agriculture and commerce provide a lot of jobs (INS, 2014). During the last five years, the city has undergone remarkable development especially in the administrative, health, educational, sports, cultural, religious and commercial (Monoprix, Carrefour, etc.).

METHOD
Urban Natural Parks are designed to preserve and improve the quality of the landscapes and the living environment of the inhabitants. As a result, the need for green spaces in cities is becoming a necessity, and city dwellers are looking for moments of relaxation, rest, recreation, outdoor activities and sports where nature is very calm. In this strategy that the municipality of Ksour Essef has requested a proposal for the redevelopment of the El Hmeda natural urban park, which is part of the sustainable development project of Mahdia city. In response to this request, the objective of this research is to propose a landscaping redevelopment in this park. The methodological approach is based on the ESA approach and the landscape analysis dealing with the different physical, sensitive and natural aspects and the development proposal is based on the concept "Treasure Hunt". In order to understand and act effectively on the Ksour essef park, we opt for an analytical approach based on diagnosis and evaluations, as shown in Figure 4, different steps followed in the methodological approach.Two principal steps are used the landscape diagnosis and the ESA assessment of park El Hmeda The physical diagnosis is based on the use of Google earth, open street map and some shapefiles. Google earth and field validation using GPS are done for digitizing and mapping the spatial delimitation of the park, slope and altitude variation for two transects, it's land use cover and field description of some stations. The park accessibility is mapped using Open street map tool and some benchmarks are located. However, sensitive analysis is based on the visual interpretation of the landscape structure (vertical and horizontal), noise, and colors in order to evaluate its state. The survey conducted as part of this research, aims to know the expectations of the resident population around the forest of El Hmeda and visitors to approve our idea of design. Ten questions in total were asked, out of 50 people, some are asked in a socio-economic context such as age, sex, the budget devoted to leisure, the distance between the park and the housing of the person surveyed. Others are asked to better understand the strengths and weaknesses of the space, the reasons for the visit, the preferred locations and the expectations of the new landscaping.
The use of this diagnosis method is based on the hypotheses of MEDALUS project model (Giordano et al., 2007). Three qualitative indexes are computed by applying an average of a geometrical model. The following three quality indices were computed; • Soil Quality Index (SQI), Administrative, land use land cover and sol Mahdia vector layers are used to map and calculate indexes. DEM raster layer was downloaded from https://glovis.usgs.gov/ and used to retrieve the slopes and aspect gradients. The data (spatial resolution of 30 m). The evaluation of ESAs is based on a combination of the physical including soil, climate, and vegetation qualities. A geodatabase and several thematic maps were prepared and standardized with the same projection system and spatial resolution. The indicators were grouped into four quality indices, namely, the soil quality index (SQI), climate quality index (CQI), vegetation quality index (VQI), and MQI (Khebour Allouche and Gad, 2014). Each indicator was calculated by means of sub-indicators, which were also classified. For each class, a weight value was allocated. The values of the weights varied from 1 (least sensitive to desertification), to 2 (most sensitive to desertification) (Gad and Lotfi, 2008).

Figure 4:
The landscape diagnosis and the ESA assessment of park El Hmeda, Tunisia

ASSESSMENT OF SENSITIVE AREAS
A large part of the park is located in a quaternary formation. The quaternary part includes terraces of major bed, mobile sand, unconsolidated scree, low terraces, dejection cones, and white limestones, probably lacustrine and often conglomeratic. Furthermore, the Ordovician part contains sandstone, quartzites, and claystone. Soils derived from different parent materials react differently to erosion, absorbency and production of biomass: the presence of pebbles still causes an increase in runoff and therefore improved safeguard from desertification (Figure4). The influence of each class for each sub-indicator constructs SQI that was weighted based the influence on desertification process. More than 50% of the area is marked by less sensitive soils. A strip which crosses this entity in the center of the forest area is marked by moderately sensitive soils. These landscape conditions encourage sensitivity to land degradation. Calculating the vegetation quality index, on basis of the previous parameters reveal that the 60 % of the vegetation cover is very weak and sensitive to desertification (Figure5). The good vegetation index class which may resist desertification is represented olive plots. The Hmeda park have an average of a precipitation of 283mm/a and the PET is inferior to 1300 mm/an. So, the climatic quality index is inferior to 0,217. That's why all the field have a weak climatic index. Figure 6 show the distribution of ESA's. It is clear that most of the Hemeda park is moderately sensitive to desertification (60 %) and the very sensitive area is located in the east.  Through the geographical evaluation of the park, in order to qualify the different biotic (plant and soil) and abiotic (climate) components, it can be concluded that the El Hmeda peri-urban park is a natural space whose distribution of natural resources is not very equitable throughout the park, which leads to rethink landscape development through conservation and remediation planning. In this respect, a landscape analysis is essential to meet the requirements of a functional and sustainable development.

PHYSICAL ANALYSIS
The physical analysis is based on the description during field visits and the use of digital media such as Google Earth, Google maps and QGIS 1.18. The park is accessible from the Mahdia-Ksour Essef road via Rojich on the north side or on the west side by the Salakta-Ksour Essef road. It is surrounded by three types of landscapes: an urban landscape constituting the center of the city of Ksour Essef, a peri-urban landscape formed by the extensions of the city and a wider agrarian landscape formed by olive groves. The slope in the park to be redeveloped is very specific which gives it a unique charm following the variation of the slopes, the division of the land into three terraces and rugged terrain. A longitudinal plot shown in Figure 7  Aleppo pine occupies more than 90 % of the total area of the park with variable densities shown in Figure 8. The northern part represents a high-density Aleppo pine plantation, the eastern part contains a medium density and the Southern part is rather at very low density. These woodlots are crossed by trails and tracks representing respectively 23 % and 77 % of accessible linear parts ensuring the circulation throughout the park.  Main entrance to the park (North side) The entrance to the park is totally destroyed: the lack of doors and fences makes the space insecure, in addition it suffers from rainwater runoff that causes the slope of the land and the difficulty of the movement of visitors. Secondary entrance on the south-east side A secondary entrance near the college allows students to visit the park and use it especially during off-peak hours.

SENSITIVE ANALYSIS
The park represents the green lung and the only virgin space in the city. It is a vast place that gives the impression of freedom. The game of altitudes presents the strongest point, it offers an open panoramic view allowing to even the whole city of Ksour Essef and even its peripheries. However, the park lacks dynamics and flexibility as the verticality of conifers dominates with a yellowish-green color and more yellowish in places reflecting the soil giving the impression of sadness and emptiness. The slopes are also a weak point; for example, the lower part of the park on the north side is the most damaged mainly by rainwater runoff and there the terrain becomes very rough and makes the movement very difficult especially for the elderly. Thus the lack of water, lighting, furniture and especially security makes the space abandoned (Figure 9).  Figure 10 shows that age groups of visitors are divided into 5 classes. The park is more visited by adults, whose age is over 50 years (26%), then comes in second place the class of visitors aged between 40 to 50 years. 20% is the percentage of visitors for both classes in the 30 to 40 and 20 to 30 age groups. The lowest percentage, 10%, represents the class of the youngest visitors (10 to 20 years old). In addition, 54% of visitors are represented by the male sex, while the female sex represents only 46%. The majority of park visitors come from Ksour Essef (58%) and Salakta (42%). Thus, 28% of visitors take five minutes by car to access the park and 24% of visitors arrive on foot. The percentages of park attendance range from 4% to 30%. From Figure 30, we note that the majority of visitors go to the park infrequently and 28% of visitors have never visited it, this is their first visit. The frequency varies between once a week and a fortnight (14% for each type). While, the budget devoted generally to leisure by these visitors vary between 5 and 20 dinars a week. Most visitors consume only 5 dinars per week for leisure (32%), almost 50% of visitors consume between 6 and 20 dinars a week, and only 8% of visitors spend more than 20 dinars a week.  Figure 13 shows that 60% of visitors find the park to be a great place to relax, and 32% see it as useful for hiking and some sporting activities. Only 8% of visitors use the park for its calm. Thus, the totality of the surveyed visitors considered that the main asset of the park is the nature and that the lack of security represents the most important constraint. Regarding the question on the facilities proposed by the visitors within the park: 25% of the visitors claim the importance of the presence of a playground for child, 22% a course of health and 20% a restaurant cafe. The lowest percentages consider the development interest in descending order of reading, barbecue, picnic and a mini zoo.  Table 2 represents a summary of the information retrieved from the study area to express the strengths and weaknesses of the studied space that can be used later for the idea of redevelopment. The park to be redeveloped is a natural urban park, located on a hill, offering a panoramic view of the entire city of Ksour Essef. It has a very large area, with unevenness and differences in slopes presented in the form of paths that snake. Thus, the relief is not very marked, ruiniform because of the calcareous texture of the soil. The rocks are sharp by the slow persistent erosion caused by water and wind. This natural park is marked by the afforestation of "Pinus halepensis" with isolated silhouettes and the grouping of groves gives it a dark green color especially in the northern part. However, this mass of pines encloses the views close by closing the landscape and hides the distant views. The elevation of the park represents the main element in the structuring of the space, it is the point on which will be based all the proposal of the development. However, the park suffers from some constraints that must be solved to achieve the proposed development. These obstacles include lack of water points and lack of security. The proposed concept aims to enhance the strengths of space created by nature and based on its physical criterion, mainly its altitude difference. Thus, three levels of development will be presented giving the impression of a treasure hunt adventure where in each part a different atmosphere will be discovered: i) the first is characterized by a flat earth and a very Aleppo pine wood. dense, ii) the second has a resting family space and iii) the third is characterized by a panoramic view open to the whole city. The main objective of this redevelopment is the sustainability of the space, while seeking to promote the meeting of people and the practice of sports activities, thus reducing stress and improving the health of visitors. The environmental aspect is reflected in the use of wood in the majority of furniture, and the densification and variation of plants to create a green lung and improve the living environment of the population. Finally, the development of the economic aspect will be favored by the inclusion of refreshments and games. ; it is a kind of game: climbing trees since this part has a very high density of "Pinus halepensis" which helps the implementation of furniture of this game. Upon entry a sign, containing the necessary information (presentation of the game, how to play and ages of users), is put to give a general idea about the activity to be done. This game is a kind of wooden cylinders fixed on tree trunks connected together by ropes and nets must be climbed. Benches and bins are scattered on both sides and candelabra installed to ensure the use of space during the night. In addition, a fence followed by an alignment of "Acacia dilbata" proposed for more security.

ANTHROPIC ANALYSIS
Entity 2: The Skateboard space presents the second component of the first treasure. It consists of a large skateboard stage and a climbing game built on a natural rock. This part begins with a sign giving information on the activities that are dedicated for young people (skateboarding scene) and for children between 6 and 12 years old (climbing game). The vegetation is very simple composed of "Pinus halepensis" with 22 "Pinus pinea", without forgetting the benches and lighting.
Entity 3: The Hide and Seek Space are dedicated for children between 3 and 12 years old. It is built of a set of wooden plates pinted in red constituting the game of hide and seek and a net for the activity of the climb. This part of the park is suitable for this type of activity thanks to the high density of "Pinus halepensis". Thus, a fence protects her, hidden by a red and mauve Bouganvillea glabra gardener, and accompanied by a wooden bench and candelabra for the light.
Entity 4: The refreshment Bar area room presents the fourth component of the first "adventure in good health" treasure. It is a forest-style space marked by an artificial waterfall, located on a natural rock, led by a floral flower planter composed of "Antirrhuim majus", "Lathyrus adoratus", and "Tagetes patula" lit by recessed floors colored. Four wooden pergolas planted around the bar, covered by "Bougainvillea glabra" and lit by colored markers.
Entity 5: The Children's play area is a playground dedicated for children from three to 10 years old. It filled with toboggans, swings, and nets for climbing activity. The lining of this space is made of colored clay in semi-circular shapes, in harmony with the general shape of the entity. A border in «Pelargonium peltatum» and colored markers to give more atmosphere marks the route.
Entity 6: the Sports area is he first terrace of the space is flat; it presents the ideal location for the establishment of a practice area of warm-up exercises. Indeed, she is busy with a few activities, made of wood, such as extension arm beams, horizontal floor abs, foot-joint jumps, and nets for climbing activity. The fence protecting the park on this side accompanied by an alignment of "Acacia dilbata". The layout of this entity marked by a border of "Rosmarinus officinalis" and recessed floors shaped "Yin Yang" with four "Salix babylonica" creating a "Zen" atmosphere giving a feeling of relaxation and joy. Planting holes of "Salix babylonica", covered with wood, used as benches.
Entity 7: The Reading Space is dedicated to the students of the college of which it is composed of six wooden kiosks, an afforestation of "Pinus Halepensis" and secured by a concealed fence in "Acacia dilbata".
Entity 8: In the BBQ area, two rock corners are proposed and made up of "Agave americana 'Marjinata'", "Crasula tetragona", "Grenovia aurea", "Sansevieria" and "Yucca gloriosa", delimiting the path of passage to the second treasure "Family and history". By lying at the barbecue area, a chessboard in the center attracts attention. It surrounded by a set of wooden balances with, at the corners, planting holes, including a wooden bench and ¾ for planting four "Elaeagnus angustifolia". The space provided on an altitude of 50 m, which offers a pleasant open view, for this reason it is converted into a barbecue area. On the right side of the chessboard, four tables in natural stones with a parasol in the center of each arranged. On the left side we have the same design but two barbecues «Lantana Camara» surrounds areas (a round table and 6 rectangular barbecues). The tables accompanied by a planter in "Zinnia elegans" and flowerbeds. A Roman-style corner, surrounded above by "Plumpago capensis", below by "Gynerium argentum", is implanted to give a historical aspect to the entity, and presents the historical identity of the city of Ksour Essef through beams from Roman times and three mosaic paintings.
Entity 9: The Panoramic View Area brings us to the third terrace and the third treasure "dream and hope". In this part, the altitude reaches 65 m offering a panoramic view open on all sides, for this reason, the idea of development was to install three wooden watchtowers occupied telescopes to give users the chance to live the adventure from hunting to great treasure. Thus, soil-fixing works take place in this part of the park, playing the protective role of the soil and a bench for the users.
Entity 10: The Network Distribution Construction Crossroads is centered on an "Elaeagus angustifolia", and surrounded by four planters of "Petunia hybrida" of four colors.
Entity 11: The parking is arranged in 45 ° to increase the number of places and for the shade, the "Ficus nitida" be used.

DISCUSSION
The cities peri-urban green lung parks represent the new tools of spatial planning; they are also green infrastructures that contribute to the organisation of the hinterland of the new urban areas. Here the peri-urban park of ksour essef, shows well following a geographical evaluation of its natural resources, as well as a landscape diagnosis based on spatial, sensitive and social aspects, it was possible to show that despite the constraints and threats that hinder the development of this park on different levels (social, environmental and economic), there is a remarkable natural wealth, a sensitivity of citizens to the importance of this space in improving their living environment, as well as the awareness of local authorities (municipality of Ksour Essef) of the importance of this park in the development of the city and also in the enhancement of the urban environment and in the preservation of nature and its biodiversity. The concept of "treasure hunt" is a guiding idea that respects the environmental conditions, the needs of the population concerned by the park's redevelopment project and the requirements of sustainable development. The objective was to encourage residents of different age groups to discover this natural space in a way that promotes the link between natural and urban.

CONCLUSION
Combining the management of sensitive areas with landscape analysis is an important discovery, analysis and decision-making process for sustainable landscape management. By protecting and managing natural and public lands in an environementally sensitive manner will help decision makers. The conservation of a peri-urban forest and its environmental managment makes it possible to remedy the negative impacts of anthropogenic events (deforestation, fires, urbanization,). These natural spaces converted into public parks offer services for society and improve the urban environment. However, this ecological development consists of ensuring visitors to the El Hmeda Forest Park the practice of sports activities in the natural environment to maintain good health, escape from a sedentary lifestyle and protect against several diseases threatening people in cites.