Juntian Chen+Projects 2019-2022

PORTFOLIO 2019-2022

Juntian Chen

02. REORGANIZATION OF RECLAMATION

Integrating Inland flood prevention and

Coastal freshwater supply

Ecological importance of the site Current

Study of the Jiangsu tidal flat and coastal environment

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

Research zone (Rudong country)

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.

Landcover change in the research zone

Landcover (1995)

Built area and agriculture: 727991100m²

Bare land: 42759000m²

Aquaculture: 32673600m²

Tidal flat: 395082900m²

Landcover (2000)

Built area and agriculture: 718479000m²

Bare land: 85581000m²

Aquaculture: 33068700m²

Tidal flat: 500102100m²

Landcover (2005)

Built area and agriculture: 743504400m²

Bare land: 75237300m²

Aquaculture: 73177200m²

Tidal flat: 382016700m²

Landcover (2010)

Built area and agriculture: 895839300m²

Bare land: 128404800m²

Aquaculture: 46798200m²

Tidal flat: 300813300m²

Landcover (2015)

Built area and agriculture: 884268000m²

Bare land: 142115400m²

Aquaculture: 106347600m²

Tidal flat: 271883700m²

Landcover (2021)

Built area and agriculture: 919288800m²

Bare land: 117594900m²

Aquaculture: 147304800m²

Tidal flat: 178367400m²

Current landuse pattern and landuse trajetories of 3 types of coastal reclamation area

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 par t of the province's coastal area).

1: Not suitable for both agriculture / urban development

2: Suitable area for agriculture / aquaculture

3: Suitable area for urban development

Landuse trajetories and relevant soil problems

IDLE L AND IDLE L AND

Reorganization of the reclamation process for 3 types of coastal reclamation area

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

Integrated water strategies for 3 different types of reclamation zone

Broader context

Nature based water strategies for risk mitigation+freshwater supply

Flood from May to October

Freshwater supply capacity: 37.6 billion m³

Freshwater demand: 60 billion m³

30% of the planned drainage capacity

1.Multifunctional peak (fresh) water storage + flood defence

2.Nature based coastal salinization defence solutions

Freshwater (+)

Salinization (-)

Stereoscopic agriculture zone

Construc ed wetland+freshwater storage Reclamation zone with soil salin zation

Wa er efficient agriculture

Potential peakwa er storage zone+ wet agriculture

er s orage

Suitability assessment of 3 development modes in the new reclamation zone 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).

Indicators

and their weights for the suitability assessment of the tidal flat reclamation area

Legend

Construc ed tidal inlet

Reconstruc ed fringing marsh

Stereoscopic agriculture

Boundar y of towns

Double dike Sea dike

Second grade river

First grade river (canal)

Freshwater direction

Tidal flat

Urban

Salt marsh and halophytes

Potential oom for peakwater storage+Wet agricultu e

Existing water body

Suitability + 3 development modes

river Chayang river

Not suitable for agriculture and urban(halophytes→cropland)

Suitable for agriculture (halophytes→aquacultu e pond→c opland)

Suitable for urban development (halophytes→c opland→urban)

Integrated water strategies for 3 types of coastal reclamation area Inland water storage&flood prevention+Coastal freshwater supply

Integrated water strategies for 3 types of coastal reclamation zone

Inland water storage&flood prevention+Coastal freshwater supply

Urban food production

Compost Food industry

Urban (Circular) Food system

Facilitating circular food production model in Gothenburg

SITE: Gothenburg, Sweden

03. URBAN(CIRCULAR) FOOD SYSTEM

TYPE OF PROJECT: Master thesis project

SUPERVISOR: Jorge Gil, Jonathan Cohen

BRIEF

Facilitating urban circular food system in

city region

Peri-urban food production

Nutrients recovery Residential building

According to the waste management plan of Gothenburg, Gothenburg are planning to reduce the food-waste production by 50% per inhabitant in 2030, while 20% more food waste should be sent to nutrition recovery or biogas or other equivalent purpose. In order to realize the goal of waste reducing and recycling. New system, service and facilities in the urban food waste recyclingsystem are required.

In this thesis I will explore how urban planing and design can support facilitaing circular economy in city by choosing the integration of foodwaste recycling system and future’s local food production planning ( ’Stadslandet” ). Scenario planning ,evaluation of keep performance indicators (KPIs) and geodesign methods will be applied in the project.

Current linear urban food production and food(bio) waste recycling system in Gothenburg

This map shows all of the actors related to current foodwaste recycling flow in Gothenburg. This map will be the starting point of next step flow mapping.

Flow type A. (from household foodwaste to energy and existing agriculture)

Flow type B. (from sewage slurry to energy and peri-urban agriculture)

Flow type C.(from industrial foodwaste to energy/peri-urban agriculture)

Flow type D. (from grazing waste to peri-urban crop production)

1.Renova-Marieholm (Pre treatment)

2.Gryaab(Slurry treatment and biogas production)

3.ST1 Refinery(Biorefinery)

energy(From biogas to biofuel)

energy (district heating)

CHP plant(heating and energy production)

farmland

MFA (Material flow analysis) based evaluation of current food system strategies for improving circularity in current food system

Data analysis A-Food demand in 2030 + Relevant demand of resources

STEP1.Implement new food production actors in urban and periurban area

Data analysis B-Gap of resources between actors after expanding food production

STEP2.Improve circularity of the food system in different recycling levels

STEP3.Balance strategy for gap of resource demand between actors

Optimization of urban food production flow (Linking urban food production to foodwaste recycling system)

New flow type A.(from household food waste to urban/ peri-urban food production and energy)

A-The first type of circular low (from household food waste to urban/peri-urban food production)

Mapping the circular steps in future's household circular food production and waste recycling system

Mapping the circular steps in the food-industrial&agriculture waste recycling

Map of actors in future's household related circular food production system

Urban circular food production flow diagram (from household food waste to resource)

STEP1

household food waste to new actors (local food production) with treatment facilities and and central treatment facility

New flow type B (from sewage to resources for peri urban/urban food production)

B.The second type of circular flow (from sewage to urban/peri urban food production)

STEP2

Local facilities for reusing greywater and from pretreatment facility to sewage plant

STEP3

From sewage plant to CHP&Agriculture

STEP4

From CHP to biofuel station

Optimization of urban food production flow------From linear to circular (link peri urban agriculture to industrial foodwaste)

New flow type C: (from food industry and food markets to local/peri-urban agriculture and energy)

C.The third type of circular flow (from food industry and food markets to local/peri-urban agriculture and energy)

Mapping the circular steps in future's industrial and agriculture circular food production and waste recycling system

Mapping the circular steps in the food-industrial&agriculture waste recycling

Map of actors in future's food industry and agriculture related circular food production system

Urban circular food production flow B. (from industrial foodwaste to resource)

STEP1

More industrial-food waste or commercial food waste to ST1 bio-refinery

STEP2 Bio-refinery to biofuel stations&africulture

New flow type D: (from residual/grazing waste to local nutrients and energy)

D.The fourth type of circular flow (from residual/grazing waste to local nutrients and energy

Linking resource from grazing field to crops field; More digestion facilities

Bakery and food industry

CHP(Combined heat and power)

Marieholm waste recycling centre Peri-urban farmland

URBAN (CIRCULAR) FOOD SYSTEM IN GOTHENBURG

SYSTEM AT URBAN SCALE

Circular food production model at urban scale and suitable locations

Suitable land for new food production actors in Gothenburg Region

Map of suitable location for 4 types of new urban food production actors

Supporting Infrastructures

Balance strategy between resources demand of actors in circular food production system

Balance model for gap of resource between actors in future's flow (After expanding urban food production)

HOUSEHOLD FOODWASTE BASED RESOURCES FOR FARMING

4 Main new local food production actors

INDUSTRIAL FOODWASTE BASED RESOURCES FOR FARMING

URBAN (CIRCULAR) FOOD SYSTEM IN GOTHENBURG

CIRCULAR FOOD SYSTEM AT NEIGHBOURHOOD SCALE

Circular food production model at neighbourhood scale ( Typical areaA: Community garden)

Community Garden

Prototye (key actor) of future's community garden

Circular food production model for community garden

Circular food production model of future's community garden

District (Parking

Suitable site for community garden

(Proximity to urban green, local compost and potential runoff )

Fish-vegetable symbiosis farm (Roof-top based)

Application of the circular model on site

Circular food production model for rooftop farm

Peri-urban (Greenhouse

Circular food production model at neighbourhood scale (Typical areaB: District greenhouse)

District greenhouse (Parking lot based)

Prototye (key actor) of district greenhouse

Circular food production model for district greenhouse

Circular food production model of future's district greenhouse

Suitable site for parking lot based district green house

Peri-urban green start up companies (Greenhouse based)

Application of the circular model on site

Circular food production model for peri-urban green start up companies

Circular food production model at neighbourhood scale (Area with community garden and district greenhouse)

Systemic section 1-1'

Application of the circular model

Circular food production model at neighbourhood scale ( Typical areaC: Rooftop fish-vegetable symbiosis farm)

Fish-vegetable symbiosis farm (Roof-top based)

Prototye (key actor) of future's rooftop fish-vegetable symbiosis farm

Circular food production model for rooftop farm Peri-urban (Greenhouse

Circular food production model of rooftop fish-vegetable symbiosis farm

Suitable locations for fish-vegetable symbiosis farm

Suitable site for rooftop fish-vegetable symbiosis farm (Rooftop of industrial building)

Application of the circular model on site

Circular food production model at neighbourhood scale (Typical areaD: Peri-urban green start up companies and existing farm)

Peri-urban green start up companies (Greenhouse based)

Prototye of future's peri-urban green start up companies

Circular food production model for peri-urban green start up companies

Circular food production model of peri-urban green start up companies

Suitable locations for peri-urban green start up companies and existing farmland

Suitable site for peri-urban green start up companies. (Proximity to existing farm)

Application of the circular model on site

Circular food production model at neighbourhood scale (Area with peri-urban green start up companies and existing farm)

Systemic section 3-3'

Location of the suppoting system for the new food production actors based on GIS analysis

GIS analysis of the supporting system for urban circular food system

Supporting system1. blue system

1.Map of groundwater reservoir and suitable soil for farming (silt)

2.Map of runoff and stream system of Gothenburg

Supporting system2. green system

1.Map of current urban green area and forest area

2.Map of functional buffer for forest patches

3.Map of potential wadi for rainwater detention

4.Map of open water surface and lakes in Gothenburg

3.Map of buffer filter for runoff/streams and green corridor along river

4.Map of buffer for lakes and wetland in Gothenburg

Location of the suppoting system for the new food production actors based on GIS analysis

Supporting system3. Relevant transportation network

1.Map of exsisting parking space for bikes and new parking space for bikes

2.Map of parking lots where farmers market and relevant facilities can be built

Supporting system4. Smart management facilities for future's food system

1.Map of water storing and purification

2.Map of smart facilities for rainwater irrigation

3.Map of existing cycling line and new cycling line

4.Map of existing walking paths and new walking paths

3.Map of (Recycling room based) food waste composting and information system

4.Map of basin for water and nutrients management

02.Green Link

Planning of Ecoduct and Ecological corridor

SITE: Gothenburg, Sweden

ACADEMIC: Year1,Semester1 (Msc.)

Tutor: Meta Berghauser Pont

04. GREEN LINK

BRIEF

Green trail + Ecological corridor

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.

GREEN TRAIL | Vision of bioswale park and multifunctional ecoduct

5.Bioswale park in-between farmpark and residential area

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. Existing shrubs and trees along the biowale are moved in order to provide better vista for visitors walking in the park and residents living. Meanwhile, 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 in nearby houses. New local shrubs are planted in the west slope for marking and provide protection for small playgrounds in the lawn.

6. Multifunctional ecoduct connecting Anggardsbergen and Balltorp

Over the highway159, a multifunctional ecoduct with 1:12 slope for both local target animals and local residents is planned for connecting anggardsbergen nature reserve and forest in Balltorp. Above the ecoduct, a 20M width green belt for linking ecological corridor on both sides of the highway is designed, soil type and morphology of the green belt on the ecoduct is referred from surrounding ecological corridor and patches. Also, Plants in the green belt are mainly local shrubs,herbs and meadows based on the study of species composition of the surrounding nature area. Shrubs,trunks and stone boulders are put on the green belt which function as a natural“screen”, dividing the 4M width trail for humans and the green area for animals. small infiltration ponds connected to ditches are created for attracting animals, also collecting water from the ecoduct through gentle slope.

07.Pilot project of Meiyuan children friendly community

Renovation of Shanghai Meiyuan community

Site: Shanghai, 2022

Situation: Preparing for construction

My role: Junior project leader, cooperated with community architect.

Meiyuan community was built in the 1980s.In 2023,Meiyuan community will be renovated and become one of the children friendly communities in Shanghai municipality. After discussion with local officers, teachers from school and local residents, a pilot site is selected and two scenarios (Co-build garden + Pick up harbor) are proposed, and now preparing for

continued discussion and construction.

Co-build edible garden at night

Site analysis of the pilot project

Scenario1: Children friendly route + Co-build edible garden

Scenario2: Children friendly route + Pick up harbor for parents

Scenario1: Co-build edible garden (Community and school)

In the first scenario, Current plant bed is transformed into a co-build garden. Nowadays, the edge of the plant bed is divided into 4 waiting areas for kids from 4 classes. Based on the current plan, we divide the greenbelt into 4 small permaculture gardens with similar areas and students from each class are responsible for each area. Children can engage in the urban farming process, cooperating with teachers and the community. Bench is added to the edge of the co-build garden, offering a rest area for local residents and parents.

Existing Plant

Children friendly route

Co-build edible garden

Co-build edible garden

Rest area for parents/residents

Scenario2: Pick-up harbor for parents

In the 2nd scenario, we transformed the green belt into a seating platform for local residents and parents. From 4 pm to 6 pm, the seating platform functions as a rest area for parents who pick up children. At other times, the pick up harbor can function as a rest area for local residents. Wood is used in the construction and local plants are planted, for adding more natural atmosphere for the community.

Waiting area for parents

Pick-up habor for parents

Kids friendly route

Other Works

+1. Tibro resilient water system (Work from Local context studio)

+2. Izmir Water Integrated Planning (Internship Work)

2. Izmir water integrated plnning (Internship Work)

I. Water integration planning of Izmir(Basin Bostanli and Poligon)

(My role: 1.GIS analysis of water system and existing water infrastructue

2.Section drawing of proposal in key zoom-in area)

GIS mapping and data analysis of Bostanli water system (Cooperated with Josje Hoefsloot)

Section drawing based on water storage proposals in zoom-in area

Section A-A

Visualization of general longlitude of the Bostanli basin

Section B-B

Section C-C

The Bostanli catchment has an extensive hinterland of approx. 40 km2. In the upstream area, many small natural streams come together and form wider streams that run towards the city. These streams are denaturalized in downstream urban areas, where infrastructure often crosses the canals. In addition, the culverts under the bridges are relatively small, resulting in bottlenecks for water drainage during extreme weather events.

Section D-D

Section E-E

Section F-F

Section G-G

THANKS for READING