SYMBIOSIS PORTFOLIO OF JUNTIAN CHEN 2019-2021
WORKING SAMPLE FOR INTERN 2021 IN HENNING LARSEN
01.
02.
Ecological importance of the site
Study of the Jiangsu tidal flat and coastal environment
Current reclamation process
Idle land after reclamation Tidal flat and salt marsh
A.build concret barrier
B.Salt elimination
C.Agriculture&water channel
Idle land after tidal flat reclamation
Pollution from local industry Industry in the reclamation zone
Intensive aquaculture Intensive aquaculture
Future planning of tidal flat reclamation and landcover change in the research zone In the coastal area of Jiangsu Province, according to current coastal reclamation and development plan of the province (2010), the distribution and management of the land for reclamation is based on the area between 2 different river esturies along the coastal line. In the map below, the future plan of tidal flat reclamation area between different esturies in 3 municipalities (Nantong, Yancheng and Lianyungang) are mapped based on the study of literature and existing document. In this project, Rudong is chosen to be the research zone for further study
Future planning of tidal flat reclamation The distribution of the reclamation area is based on the location of esturies
Reclamation plays a vital role in providing land for urban expansion and guaranteeing the food security for the Jiangsu Province (Yu and Xu.2017). Recent land reclamation schemes will cause 44%–45% loss of the most important ecotopes on mid-range and low-range littoral zones (Muller et al.2020). Based on the data from landsat 4-8, The maps below shows the trend of different types of landcover. In summary, the right chart shows that the area of tidal flat has been declining since 2000 and the area of land reclamation has been growing since 1996.
Research zone (Rudong country)
140000
100M²
120000
Land reclamation
100000 80000 60000 40000
Tidal flat
20000 0 1995
2000
2005
2010
2015
Landcover change in the research zone
Landcover (2000)
Landcover (1995) LA N D CO VER (1995)
LA N D CO VER (2000)
Built area and agriculture: 727991100m²
A griculture and building:727991100M ²
42759000m² BBare areland:land: 42759000M ²
Ti dal flat:500102100M ² Tidal flat: 500102100m²
Landcover (2005)
Landcover (2010)
LA N D CO VER (2005)
LA N D CO VER (2010)
743504400m²
area and agriculture: ABuilt griculture and bui lding:895839300M ²
75237300m² BBare areland:land: 75237300M ²
128404800m² BBare areland:land: 128404800M ²
AAquaculture: quaculture:73177200M 73177200m² ²
AAquaculture: quaculture:46798200M46798200m² ²
TiTidal dal flat:382016700M ² flat: 382016700m²
Ti dal flat:300813300M ² Tidal flat: 300813300m²
Landcover (2015)
LA N D CO VER (2021)
884268000m²
B Bare areland:land: 142115400M ² 142115400m²
ABuilt griculture and bui lding:919288800M ² area and agriculture:
A quaculture:147304800M ²
Tidal flat: 271883700m²
Tidal flat:178367400M ²
Tidal flat:271883700M ²
919288800m²
BBare areland:land: 117594900M ² 117594900m²
Aquaculture: 106347600m²
A quaculture:106347600M ²
895839300m²
Landcover (2021)
LA N D CO VER (2015) A Built griculture and bui lding:884268000M ² area and agriculture:
718479000m²
AAquaculture: quaculture:33068700M33068700m² ²
flat: 395082900m² TiTidal dal flat:395082900M ²
area and agriculture: ABuilt griculture and bui lding:743504400M ²
ABuilt griculture and bui lding:718479000M ² area and agriculture: BBare areland:land: 85581000M ² 85581000m²
AAquaculture: quaculture:32673600M32673600m² ²
Aquaculture: 147304800m² Tidal flat: 178367400m²
2021 Year
Integrated water strategies for 3 different types of reclamation zone Broader context
Nature based water strategies for risk mitigation+freshwater supply Freshwater supply capacity: 37.6 billion m³
1.Multifunctional peak (fresh) water storage + flood defence
2.Nature based coastal salinization defence solutions
Freshwater demand: 60 billion m³
Freshwater (+)
30% of the planned drainage capacity
Salinization (-)
Flood from May to October
1st grade canal 2nd grade river
+ Local sewage plant+nitrification facilities
Plain reservoir Sponge city
X
Stereoscopic agriculture zone Reclamation zone with soil salinization
Managed realignment zone
Water efficient agriculture
Ocean currents
Freshwater supply direction
Constructed wetland+rainwater storage
Potential peakwater storage zone+ wet agriculture
Muddy from channel dredging of Yangkou port
3 development modes in the new reclamation zone and water integration strategies
In Northern Jiangsu, there are 3 types of developing modes for most of the tidal flat reclamation areas based on 3 categories of suitability, and they are 1)suitable for agriculture,2)suitable for urban development,3)not suitable for both agriculture and urban development (Chen Cheng. 2017). For the area 1, the development mode is: “halophytes→aquaculture pond→cropland”, for the area 2, the development mode is: “halophytes→ cropland”, for the area 3, the development mode is “halophytes→cropland→urban development”(Xu et al.2017). Meanwhile, the development modes is also relevant to the per GDP of coastal municipalities (He et al.2021).
Estuary of Bencha canal
Estuary of Mafeng canal
Indicators and their weights for the suitability assessment of the tidal flat reclamation area Pre-condition for choosing the landuse type
Index
Factor
Agriculture
Weight
pH
√
0.1804
Organic matter
√
0.1803
Proximity to fresh water channel
√
0.2867
Reconstruct fringing marsh Existing fringing marsh
Constructed wetland+freshwater storage
Suitability assessment of 3 development modes in the new reclamation zone
Opening the sea dike
Not suitable Urban for agriculture Weight Weight development and urban Yangkou Port
Estuary of Jueju canal
Soil quality
Fresh water availability Condition of local resources Shoreline condition
Legend
√
0.1875
Water depth of the shoreline
√
0.2245
Barrier condition
√
Constructed tidal inlet Reconstructed fringing marsh Stereoscopic agriculture
Sea dike Yangkou canal
Double dike Second grade river
Chayang river
First grade river (canal)
√
Tidal range
Boundary of towns
Estuary of Juekan canal
Mafeng river
Dongling river
Freshwater direction
Jueju river
Tidal flat
Ecological condition
Landscape resources
Proximity to tidal flat landscape
Ecological importance
Ecological importance
Environmental capacity
Water quality
Transportation
Accessibility
√
Salt marsh and halophytes Potential room for peakwater storage+Wet agriculture
√
0.3506
√
0.4045
√
0.1457
Existing water body
Jiuwei canal
Estuary of Rutai canal
Suitability + 3 development modes
√
0.2103
√
0.1967
√
0.2456
Not suitable for agriculture and urban(halophytes→cropland) Suitable for agriculture (halophytes→aquaculture pond→cropland) Suitable for urban development (halophytes→cropland→urban)
Location
Juekan river
Urban
0.3852
KM
Rutai canal
Current landuse pattern and landuse trajetories of 3 different reclamation area Based on previous study, there are 3 typical landuse pattern based on different suitability: 1. Not suitable for both agriculture and urban development ("Tidal flat→halophytes→cropland") , 2. Suitable for agriculture ("Tidal flat→halophytes→aquaculture pond→cropland"). 3. Suitable for urban development ("Tidal flat→halophytes→cropland→construction land" in the central part of the province's coastal area).
1: Not suitable for both agriculture / urban development
3: Suitable area for urban development
Aquaculture
Greenhouse
Crop land
2: Suitable area for agriculture / aquaculture
Halophytes
Urban development
Crop land
Halophytes
Tidal flat
SITE
Idle land
Halophytes
Tidal flat
SITE
SITE Crop land
Landuse trajetories and relevant soil problems Idle tidal flat Suitable soil for farming Eutrophication of water Eutrophication of soil Suitable for construction
Productivity Organic matter
Tidal flat
Soil salinity
Soil salinity
Soil salinity
IDLE LAND
Productivity Organic matter
EUTROPHICATION
7 years
4 years
26 years
Halophytes→Agriculture
Farming
Halophytes→Aquaculture
Crop land
Tidal flat
Aquaculture
Salt discharge
Crop land
Productivity Organic matter
Farming
Tidal flat
IDLE LAND 7 years
4 years
Halophytes→Agriculture
Construction
Crop land
Construction
Urban development
Strategies of reorganizing the reclamation process for area with 3 different suitability Based on previous study, 3 new landuse solutions are proposed: 1. Not suitable for both agriculture and urban development (return farmland and restore salt marsh) , 2. Suitable for agriculture(aquaculture between terraced field for salt discharge). 3. Suitable for urban developme (buffer for canal and restore wetland). The aim is for balancing the time, ecological value and economical profit in the process of developing reclamation area.
Managed relignment+ Siltation Promotion
Not suitable for both agriculture / urban development
Salt elimination+ Aquaculture in terraced field
Suitable area for agriculture / aquaculture
Restore wetland+ More room for the canal
Suitable area for urban development
03.Green Link
Planning of Ecoduct and Ecological corridor SITE: Gothenburg, Sweden ACADEMIC: Year1,Semester1 (Msc.) Tutor: Meta Berghauser Pont BRIEF In this project I researched the social-ecological solutions for connecting important biotopes which is cut through by highway-159 in the south part of Gothenburg. In the project I combine the design of ecological corridors, ecoduct with social benefits for people, like public open space, cycling route and urban permaculture space. Which provide different types of landscape for surrounding residents.
BLUE CORRIDOR | Park with re-opened bioswale
A. More “meaningful” slope In the bioswale based community park, the steep slope of the existing bioswale is widened and the overgrown grass along the ditch is replaced by local meadow species, so the bioswale become more visible and approachable, also the stormwater storage capacity is improved.
B. Improve accessibility One route from the main road is added and visitors from the main road can access the park directly. Also, two 1m width gravel routes linked by 3 walkable stone check-dams on the stream are built for guiding people approach the viewpoints and small playground along the bioswale
C. Better vista along the bioswale Existing shrubs and trees along the biowale are moved in order to provide better vista for visitors walking in the park and residents living in nearby houses. New local shrubs are planted in the west slope for marking and provide protection for small playgrounds in the lawn.
04.
05. Run with water
Remediation of the floodplain + sports park, Ji An
SITE: Ji An, China TYPE OF PROJECT: Independent project SUPERVISOR: Jianjun Huang BRIEF This sports park is located in a floodplain near the Gan river in Ji-An city and every summer, part of the city would be Flooded due to lack of riverspace for holding the peakwater and lack of maintenance for the dike. Meanwhile, Gan-river is flooded due to surface runoff from nearby farmland. In this project, a sports park is designed based on the planning of a functional floodplain, where room for flood is provided and surface runoff can be purified.
RUN WITH WATER Floodplain+Sports park
Site
JI'AN CITY, Jiang Xi
Flood/pollution of surface runoff
Erosion and pollution of muddy flat
Navigation construction
Ecologial damagement
Flood analysis and strategy for different water level
Integrated water strategies
Planning of plants Water level
River dike
Water level
Surface runoff purification
3 levels of green trail in the park level 3 Walking
Water level
Section of trails
Restoration of the floodplain grassland
Plan of green trails
Possible activities in different sites
level 3 Walking
level 2 Walking+Running
Secondary forest + Grassland along Gan River
Wood trail in the secondary forest
Runing/Bicycle trail along the dike
Beach&playground along the floodplain
OTHER WORKS
Tibro water resilience system Water management planning for Tibro Kommun (2019-2020)
Groupwork project (My role: GIS hydrological analysis/Ecological corridor planning/Master plan drawing)
Construction drawing of sponge street and smart parking lot facility design
1. Redesign for Plantage Middenlaan+Sponge street solutions
Type of the project: Street design+construction drawing Site: Amsterdam, the Netherlands (Visualization, Planting design and AutoCAD drawing. Independent work in H+N+S landschapsarchitecten, 2021)
Situation of the Plantage Middenlaan Rainwater from roof
min 80mm thick concret pavers
300mm thick organic topsoil
40-50mm bedding course
(50%-60%sand; 20-30%compost; 20-30%topsoil)
200mm drainable stone base
overflow control Corten steel curb
100mm asphalt
200mm drainable stone base
200mm basecourse
geotextile
Subgrade soil
Subgrade soil
overflow control
Subgrade soil
min 80mm poprous concret
stone trench 2% slope
Runoff
Runoff
2% slope
Runoff
2% slope
geotextile
(150mm) perforated pipe
Native plants suggestion
900
(150mm) perforated pipe
(200mm) perforated pipe connecting to stream outlet
3000
(1.with deep root systems that absorb runoff and pollution; 2.suited to fluctuating water level)
1800
1000 200
500
2100
3000
Construction drawing of the street proposal section(1:75)
1. Helophytes
Alisma plantago-aquatica
Butomus umbellatus
Typha latifolia
2. Higher growing plant species (no helophytes)
Angelica sylvestris
Berula erecta
Centaurea jacea
Chamaerion angustifolium
Eupatorium cannabinum
Mentha aquatica
Valeriana officinalis
Filipendula ulmaria
Galium palustre
Lathyrus pratensis
Lotus pedunculatus
Lythrum salicaria
Myosotis scorpioides
Sparganium erectum
Asclepias incarnata
Ranunculus flammula
Thalictrum flavum
3. Staying low
Ajuga reptans
Cardamine pratensis
Scutellaria galericulata
Stellaria graminea
Veronica beccabunga
Veronica chamaedrys
Proposal of the new Plantage Middenlaanwith sponge facilities
2. Energy link ---- Symbiosis system in the electric charging parking lot
Type of the project: Parking lot planning+ Facility design+Competition Site: Chengdu, China
Master plan of the parking lot (not to scale) Drainage direction Local biotope Grass mixture Bioswale plants Wood platform
Reusing rainwater
Solar power
Biowaste treatment
For phone
Cleaning
For cars
Harvesting
Single charging grid prototype +Solar power for charging +Meeting space +Biowaste treatment +Rainwater harvesting
Green maintenance